Wadia S7i not reading the contents of certain discs

Have exactly the same problem with Wadia 781i, I complained about it here: CD Error Correction.  Spent these last months trying to comprehend the glitch, the first part of my efforts is posted here:
 Wadia 781
As promised here, Part Two is coming up, with vibration graphs/numbers for different CDs.
In short, badly pressed or warped CDs which should not be even played, Wadia wouldn't play. A few (presumably) watermarked CDs it won't play either.
I have dozens of ECM CDs, but only one is not playable by 781 (Shumann, ECM2396). Have no explanation for this, had to make a CDR copy which plays perfectly.

Steve Huntley said that his Cantata Music Center 3.0 bests his efforts for Wadia. Haven't listened to it yet

thanks so much - I just burned a cd-r and it plays perfectly.  It's a relief to know that the laser mechanism is not at fault, which would mean another trek back to Audio Research, which replaced the transport about a year ago.

-john

@sevs,

Holy cow! Steve Huntley is now working for Resolution Audio alongside Jeff Kalt? I did not know that. That would be a sort of Dream Team for the Digital Music Reproduction Field. I would love to hear the Cantata Music Center 3.0, but I'm sure it's out of my price range. I did own a Resolution Audio Opus 21 a few years ago and I thought it was a great CD player.

I would never use a cd player that wouldn't play all my discs.