Page 1 of Lecson DVD 900 Probelm

I have a Lecson DVD 900 Player which i have hacked to play region 1 DVD`s. For the last 9 months the player has worked fine and I have been very pleased with it. However recently whenever i play a Region 1 DVD it seems to be very jerky and in big Action scenes the sound becomes distorted. But with region 2 DVDs the player is its old self again. Does anyone have any suggestions as to why this could be.