dvd burner

i am having trouble burning dvds, i have dual drives, i am using a liteon smh 165h6s040. it had been doing great. i have two burning programs, nero, and 1 click copy dvd. It started last week it would burn disc, and said burn was sucessful, but when i tried to play disc, they would not load,or eject from dvd player. finally this week it won't burn but about 30 percent, using nero to burn or 1 click copy. it tells me read error and write error. i reinstalled programs but it did no good. i changed  source and destination drive to use just one drive, and it does the same thing. i have only burned about 150 movies and burner is just over 1 year old. i have changed dvd media, i use sony, philips,tdk,memorex, maxwell. +and - media , it does the same thing. i am beginning to think that it is the burner./ i don't have any problem burning cds