I don't know why this happens, but it happens to me also. I do know when it occurs and what I have to do to reconnect my Fitbit Sense to my smart phone (a Samsung Galaxy S21+).
WHAT HAPPENS: My smart phone will say the Sense is still paired to it, and I do receive notifications about text messages and phone calls; however, when it occurs I can no longer "accept" or "reject" a phone call using the Sense.
WHEN IT OCCURS: Under either of two conditions:
1) If the Sense is restarted
2) If my smart phone receives a software update. It can be either a major version update or merely a monthly security patch update. Either way the "semi unpair" occurs.
WHAT I HAVE TO DO TO FIX THE PROBLEM: First, I have to unpair both the Sense and Sense Controls from my smart phone. Next, I have to re-pair my Sense to the smart phone using the Fitbit app. In this case I must tell the Fitbit app that I am connecting a new Sense device to replace my old Sense (even though it is actually the same Sense watch). Doing it this way causes you to basically have to go through the setup process all over again. Once the Sense has been paired to the smart phone then you must pair the smart phone to the Sense Controls if you want to be able to answer phone calls. To do this you once again go into the app, under "Account", and select the Sense icon. Then press the "On-wrist calls" item under the "General" section. This will start the "Sense Controls" sync/pair process. At that point both the Sense and Sense Controls will be paired to your smart watch.
In spite of knowing how to re-pair the Sense after this problem occurs, it's frustrating to not know why it keeps occurring under the stated conditions above, and I've seen no indication as to what causes the problem on any of these forums.
I hope this helps!
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