Page 1 of Samsung DVD M105 problem

I have a Samsung M105 DVD player which is overall very good,
but last I week I watched 4 different DVD`s and experienced the following problem:

Randomely only once every film part of the picture breaks up into little squares for
a very short moment.
When I play the sequence again there is no problem.

I witnessed the same thing with a Sony PS2.
Also when they show DVD material on TV I sometimes see the same sort of break-up.

Has anyone else experienced this?