My denon dra-35v has developed cutting in and out syndrome. randomly one channel will cut out, then the other channel, sometimes both, sometimes none. the other day i took the cover off and basically just sprayed the whole thing down with contact cleaner, focusing mainly on the pots. worked a bit better for a bit but still cuts in and out. a light hit on the side of the unit will pop the channels back in when they cut out.

whats the likely culprit here? did i not clean well enough? or is there likely a bad solder joint somewhere? i'd also like to point out that this isn't input related as it does the same for two separate inputs that i have (cd player, cpu aux in).