From the comments on here it seems quite a few people are having this issue. It would be safe to assume that plenty more who don’t read these forums also have the same issue. I’d like to know if it’s something Denon support are aware of. Something they’ve been able to replicate themselves. Something they’re working on a fix for. Personally I find it real hard to replicate the problem since it seems such an intermittent problem, but denon techs would presumably be better at pinning down a cause than an average user would.