you should look in to why these miners die after x amount of hours
I haven't had problems with mine going down on my Windows 7 box at all. The speed isn't what I expected out of them though.
You're not getting the 70kh/s each? I have 30 with no issues on any of them.
I'm getting 25-35kh/s per a single one. I know that is the # if it is in dual mode but I'm 100% sure I have the switch flipped to L. I tried it the other way around and got the same hashrate.
Any trick you had to do? I'm running these without the GUI. Maybe I need to change my batch script.