Lumia 640 DUAL SIM BT issue during voice calls

emiliosvk

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Feb 23, 2016
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Hi,

I am the owner of Lumia 640 Dual SIM, previously Lumia 520 from MS family. I have an issue with BT connection between car and lumia phone during voice calls.
BT is disconnecting for a several seconds frequently then connect back to car and I am able to use car audio for a call again.
I did not have same issue with previous model : lumia 520 or e52 . It not depends if I am using SIM 1 or SIM 2 for a voice call.
Phones have been connected to same Mazda 6 also I am using airplane mode to clear band it also does not help to much.

Is there someone with same issue or solution 

Thank you
 

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