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Ok I've done a bit more experimenting. If I start the PC from cold then the drive reads several 4K discs reliably. Mad Max Fury Road, The Greatest Showman, The Batman, Top Gun Maverick. Then there is the Nolan collection - from there Dunkirk, Inception, Batman Begins, Batman TDK all fine. Then it ge...

Thanks - it is internal - I've tried rebooting the PC - will try total shutdown next.

I know it's an old thread but I have pretty much the exact issue from the OP - ASUS BC-12D2HT drive bought last week - Flashed per instructions here - Ripped maybe 6 UHDs absolutely fine - Then put in Interstellar and it makes a few unpleasant sounds and both MakeMKV and Windows say 'no disc' - Trie...