Problems with Snow Leopard + Time Machine + S-ATA dvd drive

[macduck]

Hello community
I have a problem regarding my new Snow Leopard Installation with Time Machine and my s-ata dvd drive. Whenever Time Machine tries to make a backup, it just delays the backup without any error message.

The console says following:

27.09.09 12:44:57    com.apple.Finder[91]    Unable to determine UUID for host. Error: 35 Resource temporarily unavailable
27.09.09 12:44:57    com.apple.Finder[91]    Unable to determine UUID for host. Error: 35 Resource temporarily unavailable
27.09.09 12:44:57    com.apple.backupd[603]    terminate called after throwing an instance of 'NSException'
27.09.09 12:44:57    com.apple.Finder[91]    Unable to determine UUID for host. Error: 35 Resource temporarily unavailable
27.09.09 12:44:57    com.apple.Finder[91]    Unable to determine UUID for host. Error: 35 Resource temporarily unavailable
27.09.09 12:44:57    com.apple.ReportCrash.Root[604]    2009-09-27 12:44:57.861 ReportCrash[604:140b] _CFGetHostUUIDString: unable to determine UUID for host. Error: 35
27.09.09 12:45:00    com.apple.Finder[91]    Failed to send message to backup server: error = -5Failed to send message to backup server: error = -5
27.09.09 12:45:00    com.apple.launchd[1]    (com.apple.backupd[603]) Job appears to have crashed: Abort trap
27.09.09 12:45:00    Finder[91]    *** CFMessagePort: dropping corrupt reply Mach message (0b00101)
27.09.09 12:45:00    Finder[91]    *** CFMessagePort: dropping corrupt reply Mach message (0b00101)
27.09.09 12:45:00    com.apple.ReportCrash.Root[604]    2009-09-27 12:45:00.476 ReportCrash[604:2703] Saved crash report for backupd[603] version ??? (???) to /Library/Logs/DiagnosticReports/backupd_2009-09-27-124500_localhost.crash
27.09.09 12:45:00    com.apple.ReportCrash.Root[604]    2009-09-27 12:45:00.695 ReportCrash[604:2703] Unable to determine UUID for host. Error: 35 Resource temporarily unavailable
27.09.09 12:45:00    com.apple.ReportCrash.Root[604]    2009-09-27 12:45:00.696 ReportCrash[604:2703] Unable to determine UUID for host. Error: 35 Resource temporarily unavailable
27.09.09 12:45:00    com.apple.ReportCrash.Root[604]    2009-09-27 12:45:00.697 ReportCrash[604:2703] Unable to determine UUID for host. Error: 35 Resource temporarily unavailable
27.09.09 12:45:00    com.apple.ReportCrash.Root[604]    2009-09-27 12:45:00.697 ReportCrash[604:2703] Failed to write crash history. Error: 35 Resource temporarily unavailable

The dvd drive works but sometimes it just gets lost by OS X when e.g. a cd is left in it for a longer period (half an houre). Then it doesn't even show up in the disk utility.

-the external hd for time machine is a lacie d2 quadra with firewire
-the dvd drive is a Pioneer DVD-RW DVR-212
-mother board: Gigabyte EP35-DS4

Maybe i should mention that i used the tutorial on lifehacker to install snow, and so i used the EP45-UD3P patcher

I guess its some kind of a kext problem but i couldn't find anything about these symptoms.
It would be great if someone could help me with it.

macduck