Got something similar with running. When selecting training activity seems to run fine. Otherwise constant beeping and vibration.
My problem solved by reset the watch…)
the the same on FR255 music
If you have not done so already, try posting this in the fēnix 8 forum, someone there should be able to help youhttps://forums.garmin.com/outdoor-recreation/
Same for the FR255
https://forums.garmin.com/sports-fitness/
