I'm using a Samsung S6 and the phone connection to the MZD system regularly drops out. It did it several times in a conversation last Saturday; but I notice it dropping and reconnecting quite often as you can see it downloading all the contact details as it does so.
I've put the phone in the cubby hole in front of the gear shift; also in the cup-holders between the front seats. Makes no difference.
Interested if anyone else has this problem.