I've just updated my MK2i to the APAC firmware 14.20 and shortly after the upgrade I realised my MK2i was constantly restarting within ~30-45 seconds after booting up.
After some trial and error I realised that it was restarting only after connecting to BT and Garmin Connect - if I disable BT on my phone or uninstall Garmin Connect, the phone is perfectly happy and doesn't reboot. I've also tried unpairing and re-pairing, didn't help. I'm trying to avoid doing a factory reset for now.
Never had any problem with my watch before this update. I guess my post is as much a call for help and warning to others about quickly installing the new update.