My Liteon LTR CDRW is suddenly having probs burning endtrack on CD's [using Nero 5.10.0] - at about 99% -

[so I get a movie file that sometimes can be played w Videolan but can't be f/forwarded - & sometimes no file at all]

here's key part of log:

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11:20:20 #18 MMC -1135 File Writer.cpp, Line 331
Write error

11:20:20 #19 Text 0 File ThreadedTransfer.cpp, Line 219
all writers idle, stopping conversion

11:20:20 #20 CDR -201 File WriterStatus.cpp, Line 194
Invalid write state

11:20:20 #21 TRANSFER -18 File WriterStatus.cpp, Line 194
Could not perform EndTrack

11:20:20 #22 Text 0 File Mmc.cpp, Line 12011
start Close Session

11:20:34 #23 Phase 38 File dlgbrnst.cpp, Line 1649
Burn process failed at 32x (4,800 KB/s)

11:20:34 #24 Text 0 File Scsicmd.cpp, Line 406
SCSI not using temporary buffers
20 out of 20 temporary buffers allocated

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It's

* NOT MEDIA - dont think - burned several successfully before
* NOT SPEED - tried several
* NOT DAO - tried both Wizard & that method of burning..

?? DRIVE - could there be something wrong w drive [is there utility to test?]
??OR NERO - the prog?

Any help v. gratefully received - & will definitely try to repay any suggestion that works!!