I have a S4 B1 and S4 B2. The S4 B1 is working great but the new B2 that i got in a couple weeks ago worked great for the first few days now I cant get it to hash more than a couple hours. The box would stop hashing but it would stay on, the fans on with a blank (but lit) LCD screen.
I re-seated the SD card and it worked for about 10 hours and started doing the same thing. It works if I turn the power off and turn it back on, but only hashes for a couple hours.
I got a new SD card and flashed the image from the original SD and that worked for a few hours and then it stopped hashing.
I emailed tech support and they sent me an image that I flashed to the new SD card and the same issue.
This is frustrating! I know it works, I just dont understand why it keeps stopping.
well I thought I had a fix to this but it started happening after 24 hours. I have been in touch with BITMAIN tech support and I am getting frustrated. I have asked for a RMA or a replacement motherboard and power supply to try. I think the hashing blades are OK as I have disconnected them one by one and they hash fine for 30 hours. However, when I connected all 4 of them together the unit stops hashing after a few hours but is still on and I can ping/manage the device via it's IP address. I dont see any "xxxxxxxxx" in the "miner status" screen.
I think it is the power supply, i think the load is too much and one time i heard a click when it stopped hashing. I have another S4 but it uses the PCI-E power supply where this new S4 does not, so i can't test that.
It hashes fine with just 3 blades hashing, so that is what I have running now for the past few days so I can get some value out of this S4. I hope that BITMAIN helps me on this one. I have not had any major issues with my other S4 or my S3's. I really do like BITMAIN products...