So i recently bought a new deck (pioneer DEH 7200HD) and when i put cds into it or my sub flash drive it makes a strange popping sound randomly while songs are playing.

When the car is off the noise goes away

The cd player never looses power.

There is no set screw in the cd player.

Here is my setup

Pioneer DEH-7200HD CD/Mp3 Player
Rockford Fosgate P400-4 4CH amp
Kenwood 6.5" Front Speakers
Boston Acoustic 6.5" Rear Speakers (stock)
JL audio 2150E 2 CH amp
Pioneer Slim mount 10" sub

The RF amp powers speakers
JL amp powers Sub

The popping sound happened after i changed Decks.