stereo unit freezes (also effects A/C/heat controls)

happens for hours, turning car off and on doesn't fix it. Took it to dealer, started working ...... they had no idea what was going on.

also never syncs to Bluetooth music device even though software and pamphlet have selections.

(guessing access is denied? assuming base model didn't have sound package or something?) idk.... it makes phone calls. which is good enough