I'm the same as you, received my Sense after the Ionic recall back in March 2022, It had been working perfectly, battery lasting approximately 5-6 days. On the 16th October I'd charged my Sense in the morning and whilst on a walk that evening, it vibrated to notify me I'd done my steps for the day, but then shortly after it vibrated again and continued to vibrate for about a minute or so. When I looked at my Sense the blue logo was stuck on the screen and it wouldn't do anything. I put it on charge when I got in, the battery was at 0% but after leaving it for a hour or 2 I eventually managed to do a re-start and the watch face came on, but it was frozen, I couldn't swipe, left, right up or down. So I reset it again and again and it worked, but then the battery drained back down to 0%. I left it on charge over night, but when I unplugged it it would only last 2-3 hours and it would need charging again. I've re-set it many times, turned everything off, no notifications, put it in sleep mode, sync only when required etc, so it does just the very basics now. Battery has improved somewhat and will last about 9-10 hrs but then it needs charging again, this is nowhere near the 5-6 days battery life I had previously and now not really the function/use I was expecting from my Sense as I seem to spend more time not wearing it as it keeps needing charging.
I've been with Fitbit now for 5 years, and this is my 3rd smart watch, 2 Ionic's first one bricked at 18 months, then the second one was recalled and I replaced it with the Sense. Being so fed up with this Sense battery life now, I have stupidly just bought a Versa, but I'm starting to think I shouldn't have bothered. I'm in the UK and only have 12 months warranty is totally rubbish.
