Sony DW-U18A

Hi i just got this dvd burner its burned + and - and is 8x i just formated my computer and then the computer shop guy put in the burner and it doesn’t burn stuff properly on movies they skip after awhile and ps2 games don’t even work they barely load its not my ps2 because with my old burner LG GSA 4081B burner they worked fine and i know how to burn these things i have been doing it for like a year now. how can i fix this i tryed 2 differant brand dvd-rs and still don’t work someone please help so i can give it back to the store.

someone please help

I take it you have already tried reducing the burn speed?
I burn DVD-Video at 4X and PS2 at 2X for best results