I got in the truck this morning and heard the radio while waiting for the grid heater to go off. I then start the truck and the radio is dead. I tried to get it to come on by pushing the button off and on. No luck, I drive to work and then try to look at the manual to find the fuse and before I do that I start the truck again and now the radio works fine. I have noticed in the past on occassion I hear a scratching sound or a squealing from it. It has stopped working before and after 3-4 seconds it will come back on. I am afraid I have a short somewhere or a bad connection. I thought it might be a speaker but if that was the case the other ones would work but this time it went totally dead. The truck is 6 weeks old and 2600 miles so it is under warranty. Is there an electrical person that could help out?