Soundtrack Pro freezing for no reason.

I am using a 2.66 Dual COre MAc Pro, 6Gb RAM, ATI 1900, 2 SeaGate 750Gb internals, and the 250Gb internal (with the OS and FCS2) that came with the machine. I was using a Bella Pro series keyboard, but some unknown messages in the system log caused me concern, so i disconnected it and removed the drivers, still no luck. STP freezes during saves, exporting, or sometimes for no reason at all. There are no entries in the System, Console, or Crash Reports. I just have to force Quit and lose everything since the last save. The software is all up to date, but i have been having this problem since FCS1.