yap! the same to me, 2 boards off, than another is going faulty last few days and I am worried that will go 2 boards off equally 
You have send them back than to bitmain than? how long does it take to get the new one from them?
You have send them back than to bitmain than? how long does it take to get the new one from them?
I would get them sent of ASAP because your warranty is six months and your more than likely three months into that.
We sent ours off before Christmas and got some back today, Its totally random with them is my honest answer. We sent off an L3 Board back in September didn't get it back until last Tuesday!!!!!