Fitbit Sense spastically vibrating, screen flickering, now won't power on

[y00per]

Hello!

So first of all, since I got my Sense in Oct 2022, I've loved it. So useful to keep track of steps and cardio.

However, the last week it's been really finicky. I noticed it randomly wasn't tracking heartrate correctly at the gym a few days ago - on a stair machine for 5+ minutes warming up but only having 80BPM? I'm not that fit lol!

I'd give it a wrist adjustment or 5 and it'd finally start tracking well.

Well, about 2 hours ago, I got home from the gym. On the ride home I noticed it would randomly vibrate. I'd flick my wrist to check and there were no notifications. Odd. About an hour ago it began spastically vibrating. There were no notifications but it would NOT stop vibrating. Shortly after, the "wrist flick" motion to get it to show me the time/steps etc suddenly didn't work - I had to manually press the button to check.
Then, finally, it totally shut off. Was just charged yesterday morning...

...Then it vibrated some more, began cycling as if it were powering on...
Then back off.
Then a couple more times.

Now it will not turn on period!

I cleaned the back, tried popping it on the charger, tried the holding 10 seconds. It will absolutely not power on at all.

What do?!

Thank you!!

Edit 1: left it on-charger for an hour. Checked. Screen came on! Wore it maybe 3 minutes and it had another seizure-like episode and is back not powering on.

[Guy_]

Hi @y00per - it would seem a watch in death throes like that has a fault possibly from moisture getting in which often leads to it getting hot when charging and if so stop immediately.

If you have a 2 year warranty get it replaced and avoid water further contact.

[minthesky]

Mine did the exact same thing…. I can’t get it to come on. There was no water involved. It’s been on the charger, nothing.

[y00per]

Thanks @Guy_ I don't have a warranty and the only "moisture" it should be experiencing is my sweat. 

[y00per]

Just refreshing this.