So I have been experiencing this issue for at least 4-5 months. Numerous calls to Apple Support, unpaired the watch, ran diagnostics. Sent the watch in for repair twice, only for it to be looked at for an hour and sent right back to me. I finally am on the phone with a senior technician who stated that Apple is not aware of any on going issues with the Series 5, when I told her that I had seen numerous reports of the same issue online.