Bizarre audio/MFD behavior

So my Gen 2 (don't know the trim package ... has 6 CD changer, bluetooth, and AUX input) has been exhibiting some very strange behavior. I've searched the forums and can't find anything that's quite like what I'm experiencing. The symptoms have also been changing, making it even harder to pin down.

Symptoms:

• Audio: At first, I would get no sound for the first 10-20 minutes of driving, then sound would come on but I would be unable to control volume with either the knob or the steering wheel controls; that functionality returned 10 or so minutes after the audio returned and would gyrate wildly for a while before settling in. Now, the audio starts with the car, but I cannot control volume except for very spotty moments in the course of a 1 hr drive. I can change mode, station, etc, through the faceplate, MFD, and steering wheel. It appears to be the volume that is the issue.
• Radio reception: The radio reception is now very bad. Even with the sound off, I can see the "ST" flashing intermittently as the antenna finds what is ordinarily a strong signal in the city. When audio returns, reception is bad.
• Bluetooth: I have noticed that connecting to my phone is less reliable than it used to be. It now connects maybe half the time, and when it does connect, the microphone doesn't work. It seems like the audio works, but only when the radio works, though I haven't really tested this

Diagnostic: I went through the MFD's diagnostic panel with the INFO + headlights method and saw the information in the photos attached. Basically, the amp shows NCON and there are a bunch of error codes that seem to correspond to loss of power to some component(s). This suggests that maybe I should replace the amp, but the weird behavior seems to go beyond the amp. I also checked the 12v and it's perfect.

I had similar symptoms a couple years ago along with a very sluggish MFD that hasn't resurfaced, but it eventually went away. I haven't tried disconnecting the 12v (can't fit my ratchet in there!) and I'll give the volume knob trick a whirl, though this seems to be a bigger issue than the faceplate.

Any ideas?

 

Thanks, @bisco and @Kevin_Denver. It is the JBL system.... should have mentioned that earlier.

I disconnected the battery for a few minutes and I know it reset the system because all my settings went away. But, no luck. Same symptoms as before.

Also, I checked the CD player and it is definitely putting out sound. It works like before, except that I can't control the volume. And I may need to revise about the radio reception. It seems like it's not as bad as I thought.

So, next step is check the wiring behind the CD player? This looks like a pain. I did at least disconnect and reconnect the harnesses attached to the amp, but no change.

Any chance there's a fuse issue? I pulled a couple but I wasn't sure which ones to pull or what to look for.

 

One more data point: the functionality of the volume controls appears to be related to temperature. The warmer everything is, the better it operates. Bad news as we head into fall.

 

Well, the problem has just gone away. Much like last time, it just sort of resolved itself about a week ago and hasn't resurfaced. Hopefully it'll stick.

 

Just updating for posterity: the problem came back again in pretty short order. I decided to just buy a new amp to see if that's the problem. I picked a used one up on eBay for $45 and installed it (really not so hard). Problem has vanished and stayed away for at least a month. It was definitely the amp.