Thanks for your input.
I opened the case and jostled a bit, blew air into it to catch movre any dust, and it seems to now be working, without the flutter.
I am wondering if excessive heat may be causing the problem, as I had last night just burned a dvd and was ready to burn another copy and boom, it began to flutter and not read then disc. It was almost 90 degrees in my place, as we had a surprise heat wave.
I tried other discs, blank and full, and to no avail.
It is morning here and cooler and the burner can read the disc. Will attempt to burn after I send this, but I think for now the issue may be resolved.
Can the cause be heat?