Got a head scratcher...This just started in the last few weeks. Only when the car is cold and the weather is cold (below 40 deg and during the first 5 miles or so of driving) if I hit a pothole or cross railroad tracks a bit too fast the radio shuts off. Power antenna retracts. then one of 2 things happen: 1 - If I hit the power button and it comes right back all is normal, like nothing happened. (Other than I'm annoyed.) 2 -However if radio ignores me the first few times I hit the power button, when it finally decides to turn on the radio has lost all station presets and fader/balance settings back to some default setting. and I need to reprogram everything. If it is above 45 degrees or the car is warmed up, regardless of how cold outside, I never have an issue... Is this a known issue with old JBL sound systems? Is there a fix?