HTC M9 Bluetooth problem

I have a M9 and am on ATT. After the last network update, my bluetooth doesn't work correctly. For example I use bluetooth to play music through my car stereo, the phone will connect play maybe 3 songs then the bluetooth will turn off. I recently went on a trip and connected the phone to the rental car's stereo and the same thing happened. I have tried turning off all of the power saving options, but that does not help. The only thing I can think of is to downgrade the "firmware" then upgrade it and see if that fixes the problem. Any advice would be appreciated. Thanks

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