Little late, but I just updated a few days ago and now my watch is having this issue as well. Used to last all day at work and the gym and still have 30% by the time I got home. I was at 20% with two hours left at work today, dead by the time I got off. Just ordered a series 9 for $350 on Amazon, brand new. My 4 has served me well all these years, but time to retire her.
That was my second choice. Let’s hope these new watches last us as long as our 4s did. RIP