Wiper problems of the 2000 Chevrolet Silverado 1500

While driving one day, I noticed the tow/haul button didn't work, then the gas gauge. Eventually, within a year, all the gauges stopped working. Sometimes they go on and later off again. I don't know if they are even accurate to any degree when they do come on. About a year ago the truck shut off while I was driving but after I was safely off the road it started again. That has not happened since. I have tried to find the problem but as of now I have been unsuccessful. Myself or my mechanic, who works for the county and is very capable. I know many people with the same or similar vehicles and this seems to be quite common. I also own a 2003 suburban and these things are starting with that truck too. These have been good trucks but I want to be safe and not have to get rid of my vehicles. Abs,wipers,defrost,hvac, and all gauges are affected. I have replaced hvac controls and dash gauges and other parts but still the same problems. Such as whatever hvac controls that I put in it still only works on high. Watch out if your speedometer acts strange.