Have you tried to reset it? If not yet follow the procedure below.
- You can find the reset button right side of the ethernet you need a pin or paper clip to push the reset button in the hole hold it for 15 to 20 seconds.
- Now it should reboot automatically after that set the pools again and test.
If this doesn't work try this other solution by flashing the miner with the latest firmware you can download the firmware from this link below.
-
http://miner.ebang.com.cn/article-13.htmlThen go to maintain tab and find the upgrade and put the firmware to start the upgrade then test again after ugprade done.
If any of this doesn't still work you might have a defective hashboard it needs to replace a new one or try to clean and remove the dust like the above said it might be down clock and set the freq automatically to lowest freq due to high temp that is why the hashrate drop.