Depending on where you're located, I've got a spare Symphony head unit taken out of our C5 A6 when the internal CD changer died. The radio was working perfectly so you could potentially swap over and see if the symptoms go or not?
If they do you should be able to swap the fascia and CD changer internals from your unit to the working radio from this one?
Just a thought 
I picked up a refurb symphony head unit for under £200, but to be honest if it's bricked it may be better to fit a modern double DIN head unit with bluetooth and nav to update the interior if the car's a keeper?
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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