SuperDrive ejects disks sporadically

Hi All,
For some reason, my SuperDrive wants to spit out disks for no reason. Some disks it works with all of the time. it seems to burn all of th time and recognizes blanks. some disks are ejected immediately all of the time. Some are hit and miss. I think this correlates to an OS Update.
Any insight on this is appreciated.
Here is my information:
Hardware Overview:
Machine Name: Power Mac G4
Machine Model: PowerMac3,4
CPU Type: PowerPC G4 (2.0)
Number Of CPUs: 1
CPU Speed: 733 MHz
L2 Cache (per CPU): 256 KB
L3 Cache (per CPU): 1 MB
Memory: 1.5 GB
Bus Speed: 133 MHz
Boot ROM Version: 4.2.8f1
PIONEER DVD-RW DVR-104:
Model: PIONEER DVD-RW DVR-104
Revision: A227
Serial Number: MCDTO700229WL
Detachable Drive: No
Protocol: ATAPI
Unit Number: 0
Socket Type: Internal
PIONEER DVD-RW DVR-104:
Firmware Revision: A227
Interconnect: ATAPI
Burn Support: Yes (Apple Shipped/Supported)
Cache: 2000 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -RW
Burn Underrun Protection CD: Yes
Burn Underrun Protection DVD: Yes
Write Strategies: CD-TAO, CD-SAO, DVD-DAO
Media: No
G4 733 Mac OS X (10.4.4)

Used a lens cleaner - and that seems to have resolved the issue

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http://support.apple.com/kb/HT3064?viewlocale=en_US
http://www.macyourself.com/2009/05/01/the-ultimate-guide-to-ejecting-a-stuck-dis c-from-mac-superdrive/
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