Sense stopped tracking my heart rate data

[75goats]

I've used my sense since last December and have used other fitbit devices for years. Functions have stopped working; first breathing rate, then HRV and for the last 4 nights only basic sleep. I've checked and cleaned the back. The sensors aren't blocked and I haven't changed how I wear it.

I believe the firmware is the latest: 44.128.6.12

Any ideas on what is wrong? I'm about to give up on fitbit as the device is now useless to me.

Moderator Edit: Clarified subject

[Guy_]

Hi, see the topic others are experiencing similar issues so its not your watch.

[75goats]

Thanks. I had missed that thread. I chatted with support and they had essentially the same 'restart, reinstall everything' routine which I've now done. Can't yet tell if that process solves my problem. We'll see.

[75goats]

Per my previous note, I totally reset the device after chatting with support. NO improvement in device operation. Still only basic sleep and HRV, et. al are missing!

[75goats]

Update:

I used support via chat to try to resolve this and eventually it was 'escalated two levels'. Not much changed, though I don't know if anything was done over the air to the device. I was eventually told to wear it full time and in 2-3 days it would work properly. Voila, it did; for 7 days! Then it stopped reporting details again. In the subsequent 10 days, it worked properly 1 night! 

This device is less than a year old so it shouldn't be old age killing it! Pretty unhappy about it. Will try support again but not optimistic.

[75goats]

I've interacted with fitbit support and was told more than a month ago: "We’re aware of it and are working to identify a resolution as quickly as possible." I haven't heard anything since and my device still only reports sleep details, HRV, etc. on a seemingly random basis. Nothing for days then it works for a week, then nothing, etc. When will the software/device become reliable enough to be useful?"