I have a garmin vivoactive 4. Heart rate, pulse, pulse ox etc have all failed. It must have started sometime in the night as the watch woke me in the middle of the night with a low battery warning. I usually wake with 50-60% remaining. I rose from bed and plugged it in. When I woke, I put the watch on and have no sensors. Right now the watch is a few months old.
I've tried turning it off twice, but no change. What is the next step?