Stereo intermittent no sound




I have a 08 C6 with a aftermarket stereo. It has been working fine until recently there is intermittent no sound.
I start the car and no sound, as i drive around sometimes the sound comes on and stays on but if I turn the car off the next time I run it there is no sound.
So I bought a new HU thinking that would fix it but it had the same issue. So I bought a used factory amp off ebay and same issue. It has a PAC TR-12 and a RP3-GM11 interface, could it be that?
I checked the connections and they look good.
Thanks for any help.
Christian
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