V7 Strange Fault Any Ideas?

[fanta]

I fitted a ripper chip to a V7 all worked fine for a few days then
it stopped playing DVD-r and just gave the red screen of death
Checked all the wiring could not find any problem fitted a new laser still wont read DVD-r
so removed the ripper and fitted DUO again all fine for a few days then exactly the same wont red DVD-r
removed chip again plays original fine
i then fitted the ripper to a V5 3 weeks on all working fine
i then fitted the Duo to a different V7 all working fine
has anyone had this before it would seem to be a rogue V7 that just wont stay modded for more than a few days
any ideas??