Tried doing some research on the site but couldn't find much info on this. I have a 2004 A4 Quattro 1.8T and the speakers seem to go in and out. Not all of them but sounds like the rear and base speakers are doing it. I was going to replace the HU however, I do like the fidelity of the current HU but the lack of power is frustrating.

Has anyone had this issue and if so how did you resolve it?

Thanks in advance.