I have an Artec 12x dvd+/-rw burner and I have burned a lot of dvds that worked fine as long as it is with a 4x disc, cause if it burns faster the discs have lots of skips,etc. now, it started burning 4x discs at 6x somehow so every disc i burn skips. there doesn't seem to be anywhere to change the settings to only burn at 4x. the only options i have are "maximum" or 8x. does anyone know what the problem could be?