I've been using TyTool with Jamie's improved tserver for proper episode names. Extracted files have audio and video glitches such as messed up macroblocks every so often. Have tried 2 different brands of NIC with same results. Possible culprits are:

corrupt tserver
descramble not working properly
power supply (but would a bad power supply play properly? don't think so...)

Has anyone had this issue? If so, how did you solve it?