Page 1 of My Tosh SD110e skips - any ideas?

at various times during most films, my Tosh pauses briefly.
I thought it was just the layer change, but it does it more than once sometimes, and even on single layer (R3) discs.

It`s multi-region modified ages ago, but i don`t remember it doing it since i bought it.

I was going to get the Robocop box, but i presume it won`t handle the seamless branching very well if it can`t even play a normal film! ;(