macOS big sur Problem with Bluetooth

After solving the MacOS crashing problem with the new update, I now have Bluetooth issues and cannot ride on zwift the 3rd day in a row,
day1: I had the crashing problems described with the new update on Mac OS.
day2: I updated my Macbook Pro to mac os 11 big sur. After the OS update Zwift loaded again, but was not able to use the internal blue-tooth any more (thinks it is switched off. However it is not. I can connect my blootooth headphones with no issues. )
day3: downloaded the new zwift update, but the problem persists.
I also tried already all of the measures described in topic :
resolving-mac-ble-pairing-issues-after-an-update

Any advice or help would be highly appreciated. I am in detraining already! :wink: