Charge 6 stops measuring heart rate during work out

[IMSomeoneElse]

during workouts, the "smart"-watch stops measuring the heartrate.

I understand that sometimes it might slip or be to far away from the wrist to measure, however this is not the case at all when i checked. it was very firmly attached, and when i peek underneath, i don't see the pulsing light that i usually see, even when there is no active workout. This seems to happen at random, and also randomly, the measurements continue at some point. 

Do others have the same issue? is there a way to fix it?

Besides that, there is massive battery consumption  that seems to have gone up since 1-2 months, especially while GPS is used (walking, cycling).

[Talahthas]

Welcome back to the Fitbit community, @IMSomeoneElse 

Sad to hear you're having issues with your Charge 6.
As a first approach to hopefully get things fixed, I'd suggest restarting it. Before doing so you should make sure you've synced your device to not lose any data tracked so far. Also you should verify that the charging contacts on your device are clean and the charging pins on it's charging adapter are clean as well and can move flawlessly. In doubt please have a look here:

How do I clean my Fitbit device?

Next please closely follow these instructions as timing is crucial for this procedure:

1.) Connect your Charge 6 to the charging cable which has to be connected to a reliable power source.
2.) Press the button located on the flat end of the charging cable 3 times within 8 seconds(!), holding each press for about 1 second(!).
3.) Wait around 10 seconds until the Fitbit logo appears on your device's display.

I'd like to point out that it sometimes requires more than one attempt to restart Charge 6. So, before throwing the towel, please give it another try.

If that really won't work for you, please try if changing your device's clock face will get it back to working order. Here's how to do that:

How do I change the clock face on my Fitbit device?

I'll keep my fingers crossed.