how is one a problem? you can usually tell if one jammed up by looking at the red light..
I got a couple miners that will slow down to 2 MH, so the red light will still blink.
I think this is not the stick issue (rather pool issue). Which pool you are using?
I face the same problem when tried to rent them on miningrentals. When were not rented (and mined on my specific pool - litecoinpool.org) everything was fine ... but once someone rent them the hashrate started slowly dropping to less than 1MHs ... I had to restart them few times.
I'm mining on litecoinpool.org. The sticks will mine just fine for a few hours then they'll slow down to 2MH or so.
Well, then I was wrong
I'm now 18 hours without stop on litecoinpool.org (would be more but there was electricity outage).