2006 Dodge Ram Funny things happening on dash

I purchased a used 2006 1500 Ram 4WD from a dealer in Ohio about two months ago. Milage when purchased was 27K. I now have almost 30K.

About 29.5K I noticed that when the left turn signal was deployed, the indacator on the dash would show a left signal and then switch to the right signal causing the right signal lights to flash when in the left position. I assumed I was bumping the turn signal switch and paid no attention. I also ran out of windshield washer fluid for the first time and the dash light did not warn me of the low fluid condition. I assumed the sensor was defective. So off to the dealer we went to have a warrenty repair done. The dealer found that the sensor was OK and the computer needed replacement. Acording to the dealer, "Every light on the dash panel runs through the computer." I also told them of the turn signal indacator problem. They told me the new computer would "solve all my problems" This morning I found some of the dash lights coming on then off on the highway and the MPG and DTE computer readout was also giving false readings. I reported those problems to the dealer via cell phone and was assured that all my problems were from the faulty computer. OK, so be it! A new computer was installed today. It didn't fix any of the problems. Three hours of troubleshooting later, they could not find any system faults but the problems are still there.

Tonight I noticed a new possible problem when taking my family out to dinner. When I shut the truck down (key in the off position and removed), the radio was still playing until I opened the drivers door, then the radio shut down. I repeated the process of turning on the ignition then turning off the ingition, then opening the drivers door to shut the radio off several times. The results were consistant. Could this be a new feature programmed into the new computer or a fault. Could the dealer have installed the wrong computer? I took a look through my owners manual I did not find a single word about my "new found" feature. I also looked through the 2007 and 2008 manuals online and could not find this new radio shutdown feature.

BTW: The dealer damaged my right side mirror when they ran the truck through the wash after servicing and never said a word. I found the damage before I left the dealer and reported it. They are replacing the mirror next week.

Any words of wisdom out there? I feel like I'm in the movie 2001 A Space Oddesey. I'm waiting for the computer to say "Hello Ken!"