Originally Posted by copernicium112
It is a definite glitch. I have speed comp disabled and I've run into it about a half dozen times. Screen will be locked up, steering wheel controls locked up, only thing that works in the manual volume knob. I turn it down and and it works its way back up to "really loud". Turn it down again and it becomes louder and louder, etc. Can't even turn the music off because it is locked. This creates a really dangerous driving condition when you constantly have to adjust the volume while driving.
I had a similar issue...basically, the volume would either go to the highest or lowest volume (depending on which steering wheel button I hit last), and the volume knob would only change the volume for a second before it got loud/quiet again. However, my screen didn't freeze when that happened. Anyway, I brought it to the dealership, and they just unplugged the battery for a few minutes. It's been fine ever since.