I will try that. You know I've had similiar problems with my car's cigarette lighter hole that I use for my cell phone charger. I've had to have it fixed several times, replaced, got an adapter to make it fir better and it STILL doesn't work right--drives me batty. Almost every time I take the charger out of the cigarette lighter hole, it takes the lighter mechanism with it and kills the lighter for power purposes. They have to fix the harness constantly and it involves pulling part of the dash out. Next car will have a designated power port.
Could be oxidation and corrosion due to humidity