I have a 98 Ram 1500 and when I'm driving it will all of a sudden start to flicker then it will play for like 20 minutes no interuptions. I have changed the I.O.D fuse, as well as the fuse in the radio, and the radio fuse in the fusebox. I have also checked my wires connections like 5 times. Any help is appreciated

 

Internal fault in the radio.