Wonder if anyone else has this problem

i have been burning movies for a couple of years but still no pro.i have a pioneer 107d,i have dvd shrink,anydvd vob, anyway recently i have updated my firmware and anydvd,im not sure the upgrades are the problem but i am having to voblank everymovie because after they burn successfully the regular way they might play a few minutes than it stops . just wondering if anyone else might be having this problem.not bad blanking a couple of movies but every movie sometimes ill have 8 at a time.whoo thats alot of work
please if anyone has any suggestions i would be glad to hear from you
thank you
oh yes i forgot i use the same media and never had a coaster that wasnt my fault til now so im sure its not the media