#19 The Deep Dive Fix Files: Week Ending 9 October 2026

This is a weekly roundup of significant sports tech problems that the endurance community has encountered and, where possible, resolved. Each entry covers the issue, the affected hardware or software, and the current best fix or workaround known to the community.

Suunto watch run vanishing from the Suunto app after sync

A Suunto owner finished a run, saw it on the watch, and then watched it disappear from the Suunto app. Nobody wants to lose a hard session, so this one hurts.

The fix that worked is a clean reconnect. Remove the app connection in the watch settings, unpair the watch in your phone’s Bluetooth list, and clear the Suunto app cache. Then pair the watch again from scratch. Keep a factory reset as the very last resort.

The cause has not been confirmed and Suunto has not replied to the report, so treat the reconnect as the best known route back to your data.

Garmin Edge 840 ride uploads taking hours or days to reach Garmin Connect

An Edge 840 rider reported that finished rides took hours or even days to appear in Garmin Connect. That delays your analysis and anything that depends on it.

Holding the power button for 10 to 15 seconds forces a sync, though that is really just a hard reset. One user fixed it by installing every pending update through Garmin Express, repeating the process until nothing was left. Garmin support asked for the software version but has not confirmed a permanent fix.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

Suunto Vertical stuck in a boot loop restarting every 12 seconds

A Suunto Vertical began restarting itself roughly every 12 seconds and would not stay on long enough to use.

One owner charged the watch from a laptop USB port while pressing buttons at random. The watch restarted at 6 percent charge and then completed a factory reset at 40 percent, which cured it. Others tried a full battery drain followed by a slow 5V, 2.5A charge, safe mode, or even soaking the watch in water.

None of these is guaranteed to work, so try the gentlest option first and stop if the watch shows any sign of damage.

Garmin Forerunner 970 on 18.29 restarting on the map and navigation data page

Forerunner 970 owners on software 18.29 found the watch restarting whenever they scrolled to the map or navigation data page, which can end a run mid-session.

Three users confirmed the same fix. In Garmin Connect, find a data screen that is empty or corrupted, add fields to it, delete it, and sync the watch. The restarts stop once the bad screen is gone.

Garmin staff have said they are looking into the cause.

Garmin Forerunner 570 screen going black and unresponsive

A Forerunner 570 went black and stopped responding, leaving the owner with a watch they could not read.

Holding the power button for 15 seconds or more brings it back, but only for a few hours. Plugging in the charger and waiting for the screen to return by itself have not given a lasting result either. Garmin asked for a video of the fault before it would review the watch for warranty.

There is no lasting fix yet, so recording the fault on video is the best step towards a replacement.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

Garmin Edge 840 losing its Wi-Fi network after sleep

An Edge 840 forgets that it can reach your home Wi-Fi after it goes to sleep, so automatic uploads stop working.

Deleting the network and adding it again restores the connection, but only until the next sleep. Until there is a proper fix, syncing over USB or starting a manual Bluetooth sync gets your ride into Garmin Connect.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

Suunto Vertical 2 and Race S heart rate popup appearing during activities

Owners of the Suunto Vertical 2 and Race S report a heart rate popup that interrupts the screen mid-activity.

The workaround is to back out to the home screen and restart the activity. The heart rate icon then shows which sensor the watch is using, which helps you spot a wrong connection. The reporter did not give a software version.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

Garmin Forerunner 965 headphone audio stuttering after 10 minutes on 29.05

On software 29.05, a Forerunner 965 plays music through Bluetooth headphones cleanly for about 10 minutes and then starts to stutter.

Reconnecting the headphones helps for a while before the stutter returns. A Garmin representative suggested trying other earbuds, but no consistent fix has been found.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

Garmin Fenix 9 Pro music crackle through Bluetooth headphones

A Fenix 9 Pro owner hears crackling in their music during workouts.

Reconnecting the headphones helps for a short time. Pausing and resuming playback cleared the crackle on a Tactix 8 but did not work on the Fenix 9 Pro. There is no software fix yet.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

Garmin Venu 4 heart rate broadcast dropping to a Wahoo ELEMNT Ace on 18.29

A Venu 4 on software 18.29 stops sending its broadcast heart rate to a Wahoo ELEMNT Ace, so your bike computer loses the number mid-ride.

Stopping and restarting the broadcast brings it back, but only temporarily.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

Garmin Venu 4 elevation gain differing from other devices, 601 metres against 835 metres

A Venu 4 recorded 601 metres of climbing on a route that another source put at 835 metres, which makes comparing climbing days unreliable.

The fix is to change the activity’s elevation source to Garmin DEM in Garmin Connect. In the reported case the 835 metre figure corrected to 578 metres. This corrects the saved activity only, so it does not change what the watch records on the next one.

Garmin Forerunner 955 vibrating continuously

A Forerunner 955 began vibrating without stopping. The only way to silence it is to switch the watch off.

It is triggered most often by unplugging the watch from its charger, so you can expect it at the start of your day.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

Suunto Race 2 heart rate zones ignoring the aerobic and anaerobic threshold settings

A Suunto Race 2 owner set their aerobic and anaerobic thresholds, but the watch kept using different heart rate zones.

The fix is to enter the zones directly on the watch. Also turn off special heart rate zones under Settings, Training, Intensity zones, Advanced zones. After that the watch uses the zones you set.

Garmin Forerunner 970 notification tones sounding in Silent and Do Not Disturb on 18.29

On software 18.29, a Forerunner 970 can still sound notification tones while set to Silent or Do Not Disturb, which is a problem in a quiet room or on race morning.

Garmin support says software 18.32 fixes it. It is still rolling out, so check for it with Menu, Watch Settings, System, Software Update, Check for Updates. Night mode works as a stopgap until the update reaches you.

Garmin Venu 4 Touch Lock not working as expected

A Venu 4 owner could not get Touch Lock to behave, so stray touches still reached the screen.

Device Lock is the working alternative and does the job of keeping the screen quiet.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

Suunto Race 2 incoming call notification staying on screen after answering on Android

On software 2.53.42 with Suunto app 6.13.8, a Suunto Race 2 keeps showing the incoming call notification after you answer the call on an Android phone.

Pressing the crown dismisses it. Suunto has not replied to the report.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

Garmin Edge 1050 ride profile totals dropping on 32.20 and 33.05

Edge 1050 owners on software 32.20 and 33.05 found that their ride profile totals dropped, so long-term distance and time no longer add up.

Garmin suggested powering the Edge off after each ride, which does not fix the problem. Garmin is collecting logs but has given no fix or timeline.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

Garmin Forerunner 970 Eat and Drink alerts staying silent

A Forerunner 970 owner set up Eat and Drink alerts for race fuelling, and the watch never sounded them.

Garmin says custom alerts are suppressed during structured workouts, including Garmin Coach plans, the Daily Suggested Workout, and TrainingPeaks and Garmin Connect workouts. The workaround is to start a plain Run activity with no workout loaded. The owner says the alerts also failed in unstructured runs and races, which that rule does not explain.

This issue remains unresolved — if you have encountered it and found a fix, the discussion is open on r/the5krunner.

More from last week’s Fix Files roundup.

Browse every issue in the archive at the Deep Dive Fix Files hub.

Last Updated on 9 October 2026 by tfk the5krunner