My G65 was doing flaky things, and the cure turned out to be opening it up, removing cards (with appropriate anti-static precautions), cleaning the card contacts with isopropyl alcohol, then re-seating all the cards. It worked wonders for resolving a range of odd issues. Hope this helps!

Office: MacMini + Roon -> MS600 -> AR LS-9 -> M60s (1993 vintage)
Home: [AppleTV -> HD621] + [Roon -> 218] -> G65 -> DSP5200HC + DSP5200s + DSP3200s
Being a JAFA in Auckland, New Zealand