Prob with sony dru 830a dvd-rw

Hello. I got this drive about 3 weeks ago. It worked fine out of the box. I took a trip to SC and when I came back a couple prob have come up.
1st. It will see and play Cd’s dvd’s and the like but it will no longer pick up my DL-dvd’s. I use Verbatim DVD+R DL which worked fine in the past. Along with that when I even try to access the drive with a blank DL-dvd in it, it causes windows explorer to stop responding. It shows no disk in the drive anyways. But as soon as i eject the blank DVD its back to normal. This is driving me nuts any help would be great.