Second time my mk3 shut down and rebooted in the middle of an activity

It would be interesting what activity, settings, any special settings or maps. Are you using any other feature during that activity. How long was the activity

Mine never did a reboot during an activity. Longest activity was appr. 9h

The first time was the run app. I had headphones, and HR monitor connected. I keep the GPS on every second tracking, (All + multiband) and the only map was the one preloaded on the watch. The second time I was using the bike indoor app and had an external HR monitor and headphones connected. The only special feature was a self-created workout that I've used many times. (only a few steps, 15 min, 30 min, 3x5 min)

The first time it rebooted, I started the activity and then stopped (within a few seconds), It completely shut down and rebooted when I restarted it. The second time happened, about 50 min into the ride, just shut down and rebooted. 

I did do a dive that morning, with no issues. (56 min using the T2 transmitter)

Does not sound too exotic

The MK3 firmware is a bit behind E2 and F7, so maybe those issues got fixed.

Garmin-Laurie

running.beast

are you using audio prompts? In the f7 forum there is a report that there is a correlation between the prompt and reboots during activities