I have a liteon SOHW 1653S and always had some problems.
In the first period of its life it worked with no problems, but almost three months ago it started doing some strange things when writing lead-in and lead-out dealing also with power calibration errors.
Now it started making bad sounds from inside when I put a Memorex 8x DVD-R (CMC MAG AE1) and won't recognize the DVD at all. The sound seems the same when the motor that moves the laser pickup want to move it outside the guides ("stack stack").
If I put another kind of writeable DVD (Verbatim or also Fujifilm for example) there seems to be no problem, also no problem with any recordered or printed DVD (Memorex also works in this case).
What's up? Maybe the laser is deteriorating?
edit: I forgot to say that it happened with CSTR firmware, so I went back to CS0M and erased EEPROM media learnings, but still happens.