Schmitter

I have a similar issue with my 2007 Silverado HD (New Body Style). Mine is the basic truck with plastic floors, just power windows and door locks. No cruise or keyless entry or fancy mirrors. When I drive down the highway and use the turn signal as legally required, the radio shuts off for a second and reboots. Sometimes it only happens once, sometimes more than once. Sometimes it will do it when I tap the brakes. This wouldn't really bother me, but when I get to my destination, and turn the truck off, it is as if the battery is dead, so I make sure the windows are up before I turn the truck off. A code reader says "no battery voltage". If I turn the key, it will send the tach to bounce negative numbers a couple of times, but I can't start the truck. The only way I can fix it is to disconnect the negative battery terminal and reconnect it. The truck will then run normally for a random amount of time before it happens again. Sometimes the same week, sometimes the same month and sometimes it will skip a month without acting up. I have had it to the dealer, and they cleaned the ground and wanted to keep the truck until it happened again. The problem is that once I disconnect the ground to get the truck to run, the problem goes away for longer than I am willing to be without my truck. If they cleaned the ground, would that mean that they checked for voltage drop?