Tdk 840g problems

i got a tdk 840g and it burns everything except for tdk 2x dvd-r medias
anyone have any ideas whats wrong with this burner?
the firmware is 1.04 off tdk’s webpage
and i also tried to change the firmware back to 1.03 but both firmware did not work.

i’d put the dvd-r in the drive and it keeps on spinning with the orange light. i’d tried with some 1x riteks and it works fine. loaded up dvd decryptor and it burns fine. for some reason the drive doesnt read tdks dvd-r 2x. anyone have same problem or know of any solution.