In my impreza I have my steering wheel controls connected to my bt920 and for some reason my buttons my buttons lose functionality randomly. Once I lost volume up then mute. I am able to reprogram and it works again for a bit but then eventually they lose functionality again. I am using the pac swi-ps to connect my steering wheel controls to my unit. I had this problem once before so I got a replacement unit and wiring harness and reinstalled. That seemed to do the trick until yesterday when the problem seems to have started all over again. It was fine for months then all of a sudden it just seems to freak out.
Thanks in advance.