I got a whole new system put in last week. System includes head unit, 4 door speakers, Fosgate amp and MTX Thunderform and 2 10’s. I was going to do it myself but found a local shop that would do it for $140. Anyway picked it up sounded awesome, following day at lower volumes I noticed a little distortion, no big deal. The problem got much worse over the next few days. Took it in yesterday, guy says a wire was “pinched” , leave there sounding good. Get in this morning same as before WTH? Any ideas