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Welcome to the Fitbit community, @Hjwhap!
Sad to hear that your Sense 2 isn't working as expected. Thanks for having tried to fix your issue by yourself. I'd suggest trying to change the clock face of your device to see if this will get it back to working status. To do so, please follow the instructions provided below:
How do I change the clock face on my Fitbit device?
I'll keep my fingers crossed.
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