Timely sound loss of the audio system

Hello and good morning in the round After purchasing the car (XC70 II, 2.4 D5 AWD, EZ 2013) I had a temporary total failure of the audio system (the topic has been discussed here in detail in the forum) I got a new Mediaplayer module (MPM). The system ran without any problems. However, for some time I have a similar problem again. The sound (radio, navigation, telephone, parking aid) interrupts temporarily, but then comes after different times like During a telephone conversation, my interlocutor can still hear me. However, I have no sound. I can’t see a pattern of times. I sometimes drive for days without problems, then again the error occurs every 5 minutes. Partially, the BT connection to the mobile phone is interrupted. If the interruption takes too long, I can repeat the sound by switching off and on the audio system. In contrast to the first error, there is here at interrupting the The car doesn’t have to be turned off and the door opened. I hope someone has the right idea here. First of all, thank you to those who have read up here.