I am currently using the GUI and I have no problems with it reaching full speed.
Make sure the LTC only is checked.
Also make sure your hub is giving it enough power. Some hubs to not supply enough.
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.