Fuel gauge quit working, had it fixed. Rear air suspension went out, had it fixed. Now we have had the car shut off, gauges quit, won't start, have had to jumpstart or charge the battery to get it going. This has happened numerous times in the last year. Check engine light stays on all the time, car runs and drives fine when it is working, just never know when it will quit. So far has never quit while driving, only after it is shut off, then everything goes haywire, lights dim, radio changes channel, and has a buzzing sound from speakers, gauges fluctuate. Any ideas??