Repeating Menu scramble; A Mystery.

I created several short DVDs for a museum exhibit. The client requested that each have a moving menu that would act as a screen saver.
I created the DVDs in DVDSP4 using a .m2v file for the menu background, with a single invisible button to start the presentation movie.

The problem is that they say that these DVDs 'scramble' after only a few hours of playing the repeating menu. I claimed it was most likely a finicky machine, as it played on my DVD set-top player for over 12 hours with no problem. They tried another player and claimed it scrambled after 3 days. (why they would leave a DVD playing for three days I don't know.)

My question is is there another way to create a moving menu? or 'screen-saver' effect?

(These discs were burned on Taiyo-Yuden DVD-R with a brand new MacPro.)
-drew