Ok. One of the things I wanted to find out with the debug mode is WHY the hashrate drops to around 2.5M/s, is it because some cores stop being activated (after a restart), is it because some data doesn't get transmitted, (USB hub clogged up has been suggested). I know it drove me mad at one point, but since now everything is stable (running 11 sticks on 1 hub at around 55Mh/s total) I am happy.
Running 10 ML2. Can't seem to get past 3.5Mh/s on average. I have 2 that drop to 2.5 Mh/s which brings the average down at 744 Mhz. Even if I raise the freq, the hash eventually settles at 35 Mh/s. I'm thinking it is wattage at this point. Using Sipolar A-400. Haven't played with the memory voltage, but maybe it is time to play with that because I think I've hit the wall in terms of 120W (12 W per device) on the Sipolar A400.