AVS Special Member
Join Date: Apr 2007
Location: USA - California
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I find HD-DVDs to be far more sensitive to dust, smudges, dirt, scratches, etc. than DVDs or Blu-rays.
Overheating? - Make sure the player has plenty of air circulation. Mine is in a home theater cabinet in a stack of optical media players - but I always keep the front door wide open when using any of the players - and I do not keep significant heat producing equipment in that cabinet or in that equipment stack at all (ie. the high powered receiver throws heat and is outside of everything as a result).
Cleaning? - when a disc hiccups on me, I usually clean it (I use one of those old Discwasher disc cleaning units). You might try making sure there isn't some dust floating around inside the player also. Just eject the disc drawer and use a can of compressed air to try to blow out any dust. I've been known to open up a player and use denatured alcohol on a q-tip to clean the laser assembly area also to solve playback problems - but I would not recommend that except as a last resort.
I also doubt this has anything to do with your firmware 4.0 installation. It is most likely related to your HD-DVDs themselves.
A long-time audio/video addict!