Check the “Expresscache Version 1.2.1 released” thread, Sandisk acknowledged the issue there and indicated it was (mostly?) cosmetic, but no ETA on a fix.
The solution appears to be wait for the fix or downgrade to an earlier release (which is not advised by Sandisk).
Had to remove it from my rocket raid controller because it kept setting off the alarm:P but on motherboard controller it seems more prone to resets, i think iread in another thread that am3 boards do it, too early to say much but its reset a couple times.