Jay - how do you get the firmware update?Typically a firmware update will resolve the stereo issues. Flip me a message if you'd like to try that.
I can't comment on the A/C issue, add some more details about whether the a/c compressor clutch engages, do you see the revs increase at idle when you turn on the A/C, is there a leak in the system anywhere etc?
you'll need to email him. He provided the address in his replyJay - how do you get the firmware update?
you mentioned on a thread that a firmware update would be needed:
I have a 2015 Passat TSI with the Fender system that works great, for about 5-10 mins then reboots, and reboots... someone said it would need a new motherboard... but if I can do the firmware update, I would like to try that 1st.