bluetooth mic question

[blowthemup 10+ year member]

I have a pioneer DEH-X9500BHS cd receiver with bluetooth. Can I shorten the microphone wire or how should excess microphone wire be stored? Having sound issues when placing or receiving calls. The sound sometimes fades out and gets really soft. I can almost barely hear the person i'm talking with but they can hear me fine. If I turn it up to hear them better, once past a certain point it results in feedback on there end. It doesn't do this all the time and could use some help figuring it out.

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