brighter_joe

Hello all, I have searched through different forums and threads and so far found nothing relevant to my question so hoping somebody may be able to shed some light... My A4 B8 has the MMI 3G+ system and works great, has done since i brought the car a little over three years but ive now noticed that the bluetooth will randomly disconnect when im talking on the phone. halfway through a conversation and will just disconnect from my phone, i then connect it back up and is fine, it will also freeze up when i try and click to end a call and sometimes when my phone rings it wont come through to the car even though the symbol shows as connected. I've tried resting the mmi system and even reset my phone which didn't work. Has anyone else had this issue before, and if so, what did you do to rectify it? Appreciate any advice given.