That's a Firmware crash, and the only ones that can understand it are the fenix 3 folks. There hasn't been a support forum for a few years, so use the Garmin Support forum. https://support.garmin.com
That said, with an 8 year old device, it's also probably been a few years since the firmware for the f3 has been updated, so you may not see a fix.
If this crash has started to expose without any new application installation maybe problem is with watch's drive - simple is full - so check free space.
