"Nudging" solution works fine for Panasonic DVD-RV22. Thanks to Jarret for easy fix. Nudge it once and it is working again on its own. I would add, just in case, that the platter spins clockwise, so try to nudge in that direction. I put a note with the spin rotation somewhere inside the case to remember next time, if it stops again. I'll keep an eye to see if eventually will need oil as suggested by Nelson Perez.
Ray Carrion, November 2005