Since the 8.2 update, it's been necessary to reset my 245 every day. When I wake up Body battery, Sleep data and HR data are all blank and have collected no data overnight.
I'm going to look for instructions to revert to the previous firmware. The watch had been stable for several weeks prior to the update.
I like the watch and the data overall, but for a $300 watch it's had a lot of issues and has required an inordinate amount of troubleshooting in the 3 or 4 months I've owned it.