Tried different pools, but the same 2 'x' asics failing appears again. They fail just after running for 30min or more. Fedup with it.
Today i saw a strange thing in 1 miner which was working good till now. few Asics got dissapeared in 1st row. So i restarted, then half of '0' got replaced with '-' .
Again restarted and its working fine now. What is it with this weird behaviour?my miners are not even a month old and have problems

It appears that unlike S1 workhorse, S4 is like a bitch. It work good for couple days and stop hashing until after hard boot. It's very temperamental and have to keep an eye out. I treat my S4 like a high maintenance woman.
Sounds familiar. Funny is that some show some weird stats... for example when ASICs just disappear:
oooooooo oooooooo
oooooo oooooooo o
Or the hashrate is shown as 5201 something for getting to 142 the next second. Or the machines just completely disappear in the network for hours before re-appearing out of the blue....
Really like what you call a high maintenance woman...