DVD drive misbehaves after a while, kernel problem?

After between 10 and 60 minutes of uptime, my DVD drive begins to show strange behaviour:

• an icon appears on the KDE desktop showing either a data CD-ROM or an audio CD (although the tray is empty and closed)
• in /var/log/kern.log, these messages appear in large numbers:

    Dec 18 10:28:00 guitar2 kernel: hda: cdrom_pc_intr: The drive appears confused (ireason = 0x01). Trying to recover by ending request.
    Dec 18 10:28:00 guitar2 kernel: hda: status error: status=0x58 { DriveReady SeekComplete DataRequest }
    Dec 18 10:28:00 guitar2 kernel: ide: failed opcode was: unknown
    Dec 18 10:28:00 guitar2 kernel: hda: drive not ready for command
    Dec 18 10:28:02 guitar2 kernel: hda: status error: status=0x58 { DriveReady SeekComplete DataRequest }
    Dec 18 10:28:02 guitar2 kernel: ide: failed opcode was: unknown

At this stage, the drive becomes unusable, while it it is working fine otherwise. A reboot "fixes" the problem, until the next occurence.   

I am not sure where to report this bug - maybe for linux-image-2.6.23-1-amd64? Has anybody seen something like this before? Any hints how I could rule out faulty hardware?

I am running debian testing (amd64), with both 64-bit kernel and userspace. The problem appears with any of the 2.6.18-5 (stable), 2.6.22-3 (testing) and 2.6.23-1 (unstable) kernel packages.

my hardware:
- PLEXTOR DVDR PX-760A, firmware 1.07

 (restored to original Plextor firmware for this bug report)
- mainboard Gigabyte 965P-S3, with this IDE controller:
  03:00.1 IDE interface: JMicron Technologies, Inc. JMicron 20360/20363 AHCI Controller (rev 02)

Any further information I should provide?

Thanks,
Mirko

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