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The original was posted on /r/hometheater by /u/phealey1979 on 2023-08-18 21:24:56+00:00.

My Denon x3700H has recently (no changes made) started to pop and either go to the Audyssey setup screen or go into protected mode, red flashing light. I’ve re cabled everything twice so it’s not a speaker wire short. I’ve also tried to setup speaker calibration again. It can happen 5 minutes after starting to play content or sometimes I can get through a whole movie fine. What are my next steps?