Bluetooth problems kenwood KMM-L200BT

We have a strange Bluetooth problem over here. Hands free phone calls over the car radio have the problem, that the caller is almost silent. Can be heared very weak if the radio is set to maximum. Of course after the call the radio etc is very loud.
But the problem is not with every call but only with some devices calling. Also some calls are made via landline phones. We have two fp3 with /e/ android 9. Both have the same issue.

We tried already a lot. All the trouble shooting. Save mode, network factory reset.

Anymore ideas?

Is /e/ 10 likely to solve the problem?

We switched back to FP OS Android 10. That solved the problems.

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