I'm running Debian Testing with the following kernel:
Linux marvin 2.6.11-1-686-smp #1 SMP Mon Jun 20 20:18:45 MDT
2005 i686
GNU/Linux
My system is a 2.8Ghz Intel P4 with hyper threading enabled, 2GB RAM,
and 2 SATA drives running in software RAID-1 (everything is mirrored
including the boot and swap partitions).
Well, try another kernel and see if the problems is still there.
2.6.14-rc2 has only a lot of fixes and clean ups to become the new more
stable kernel, maybe that could help you?
.Alejandro