The Sony is a 5 disc changer and about 1 year old. I also tried playing the split title on a Toshiba DVR and a Pioneer DVR (3 yrs old) and both had troubles with it in scanning at a higher speed mode.
I tried it on an old made in China player works perfectly.
When I copied the same unprotected movie from Player to DVR it worked perfectly on all machines so I suspect it's something to do with
DVDFab and the way to copies splits, as Full disc versions never have a problem.
I will try to burn at a lower speed the next time and see what happens.