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Ciao @RutgerD, welcome to the Fitbit Community forums.
Thank you for all the details that you've provided and confirming that you already tried the hard reset. Make sure that you've also tried the restart procedure described here.
I've also sent your information to the Customer Support team for further assistance with this, but was informed that you already have a case created or that you already got in touch with them. I hope everything goes well.
Keep me posted on the outcome.
Best Answer