lagging mouse ergggggg

[pie55]

as of last week, my mouse in protools is lagging. Sometiumes it works for 15min then starts. sometimes right away.
I"m running Mac os 10.6.7 with Protools hd 8.1.1.
2 months ago I installed a new accel card upgrading to a hd3 accel system.
All cards pass digitest

Since the upgrade I've mixed 3 songs with no issue.


around the time of the start of the lagging mouse I changed the dsp cache from "use" to "NOt"


I switched it back. worked for 15-20 min then lags again.


in activity monitor the hard drive spikes around the time it lags. when playback stops, so does the lag most of the time, not all the time



Last night I was recording 2 tracks @ 88.2 and it was lagging all the time.


I've tried all the different setting in "playback", i've tried disconnecting all the external drive and usb hubs.
I've tried everything google had to offer.



I really need this fixed as I have session s all next week as grant time is emerging.
really don't know where to start


help anyone... tks