Here is what I have tried so far. I cleaned it but didn't make any difference. It burned a couple of 4X DVD+RW and one failed data verification, HOWEVER, the same media failed on another DVD drive, so it may not be the fault of the drive. It burned some 8X DVD+R, ones with data failed verfication. But those burned with videos worked when tried on another DVD drive; it has trouble reading these video DVDs it burned, usually towards the final 1/4 of the DVD it starts to experience trouble, freezing and crashing PowerDVD. The video DVDs otherwise play ok on the other DVD drive. I also noticed when it's burning a DVD, the speed is about 5X, but towards the end of the task it speeds up to 8X. That seems to coincide with the area that it has trouble reading.
Frankly I am not sure what it means when a DVD drive can't quite read what it's burned, when the end result DVD is otherwise working.