nexus 6p bluetooth troubles after update to 7.1.1

my wife own a nexus 6p, a very great phone i think, she never had any issues with it, till few days ago it updated to Nougat 7.1.1, she uses the phone often in her car, and in the past the phone connected without any problem to the cars bluetooth to make handsfree calls, but since the update the phone connects to the bluetooth system and in a few seconds disconnects, and we cant find a reason why her phone keeps diconnecting the bluetooth system since the update.
Does anyone has simmilar...

nexus 6p bluetooth troubles after update to 7.1.1

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