DVD Drive Problem

I'm currently using Win 7 Ultimate Build 7600 RTM, and i has a strange problem with my DVD drive (Model: TS-L632D). When i insert a CD/DVD into it, sometimes it continues reading the disc, otherwise it disappears from My Computer until next restart. I'm sure that my firmware is updated ( version DE04) and my DVD drive works well.
Does anyone have any ideas about this problem? Pls show me how to fix it ?

Try this: Your CD drive or DVD drive is missing or is not recognized by Windows or other programs

notsograymatter
using windows driver seems good and i've checked for update recently in device manager but don't have any .

whs
it's not that my DVD drive is missing or not recognizing. It just sometimes disappears from My computer when i insert a disc, otherwise it works well.

i guest that's not a system error, may be others programs cause this unusual problem. Any ideas everyone ?

Random disappearance when insterting disks is most commonly a overloaded PSU.