Well if the problems arised with more than 1 game then it could be either -

The discs u r using r crap, sounds stupid but i know of some disks that are loose on the psx spindel and r hard to get working. Have u changed to a different brand of disk?

Or your actual modchip has cacked up. U didn't mention other copied games, is it just these 2 that are messing up or have u noticed problems in general?

Probably i am approaching the problem from completely the wrong angle, but there could be something going wrong down the psx end if the cds are copying ok.

neway, just a few suggestions but i hope they are of some help.

4nim4l.