DAE Errors 9060, 9031, and 9073

[AldenWitt]

So, lately I started getting these two errors--separately--in my PT M-Powered 8 sessions:
DAE 9060 and 9031, and
"DAE can't get audio from the drive(s) fast enough. Your drive may be too slow, or fragmented, or a firewire drive could be having trouble due to the extra firewire bandwidth or cpu load. (-9073)"

My audio drive is an internal, 7200rpm Sata II drive. It's 100% defragmented, NTFS, (actually, my OS drive fits this description as well), and has some 450 of the total 500 gb still free. What's goin' on?
The system is new, with an i5-2500k (though both these drives run through the sata III ports). I want this thing to run flawlessly, so this is a problem. It's also becoming more frequent.

I'm having this problem in more than one PT session.

Thanks