A couple of weeks ago the display on my JBL showed nothing, totally dead. Next time I started the car it worked fine.

Friday on the way home from work I had a stranger gremlin. The climate control was in AUTO mode with the driver's switch controlling both driver and passenger side. I looked down and the DUAL light was lit. Thought this was strange as I had been the only one in the car for several days, so I turned off dual mode and continued. Looked down a couple of minutes later. Even though I had not touched the climate control it was again in DUAL mode. The TCH and I continued to play our little game the rest of the trip. I tried doing different things; changing the temperature, changing the fan speed, even pressing the off-hook button on the steering wheel. No correlation, it would just go into DUAL mode whenever it wanted. Did the same thing the next time I started the car.

Since then it has not repeated the problem.