had the same prb, found this plugin to disable the UMD drive =D

http://is.gd/4WrpN

it solves problems like:

1. emitting the red laser although there isn't any UMD inside the drive during start up (which causes the PSP to hang at the XMB menu for a short while)

2. the sudden "Do you want to quit this game?" while inside a game.

doing this will disable ur UMD drive until u deactivate that plugin.