Oem stereo problem

[Abomb1]

Wondering if there is a known cure for this without getting a new stereo. Sometimes while listening to the radio it's as if one of those "loudness" switches gets pushed and the sounds coming out of the front speakers is very distorted. I thought it was the original speakers possibly being blown and replaced them with some Rockford fosgates, but it still happens. It's like the radio has a mind of its own, it will do it in the middle of a song and then get back to normal again without me touching any buttons. Anyone else ever have this and find a solution? The truck is an 88 suburban and it's the stereo with the tape deck.