Radio/tape Cd Player problems of the 2009 Volkswagen Routan

Car electrical system goes crazy, speedometer needle goes crazy. Radio turns off and on, then the vehicle turns off completely. It turns on after. Sometimes all this happens before turning off, sometimes it turns off suddenly with no warning. Have spent a lot of money trying to fix issue with no luck. Driving it makes me very nervous but I can't change cars right now. It has happened both on small streets and highway in motion.

I just purchased the 2009 Volkswagen Routan. I have had it 3 weeks it randomly died when test driving the van and all the alarms and lights came on. We just thought I didn't have the fob in right. Then it started to randomly not start, even the remote start will not work. The lights, radio, alarm, windows and door locks work like they normally should. Usually if I wait like 20 minutes and keep trying the key (taking it out of the ignition and reinserting it) until it starts. The check engine light came on for 7 days. Thursday 10/10/2019 nothing worked let it sit overnight and still nothing tried to jump it and it finally started. Took to place I purchased jd byrider in janesville, WI and they believe it was the starter because it was not turning and it was replaced on 10/11/2019. Then 2 hours later the car again would not start again. The dealer came to rescue me and we tried the actual key and at first it didn't work, we pushed the gas and it as as the gas pedal got stuck for about 30 seconds but started. Then driving down route 26 from johnson creek, WI to janesville, WI, it was making squeaking noises from the engine. We could hear it through the heating vents. Then the tire pressure warning light came on and it kept dinging. When I got to janesville, I checked the tire pressure on all the tires and it was fine. Because I live in rockford, IL, I drove down i90 and the car at times started shaking like it was going died. Again, today it won't start not even with an actual key. Also, the driver side passenger door lock is not working and had to have a part ordered. The vehicle has 129,000 miles.