I have similar problem of lower hash rates, about 1/2 to 1/3 less after a few weeks of use. What are the chances of sending the iBelink 11G to iBelink, or receiving replacement hash board? My purchase was on September 21, 2017.
I have already submitted a ticket in iBelink website and waiting for response. Just checking here as far as what members are doing for resolution.
Update: I want to make sure to submit the request within the 90-day period.
Can you provide a screenshot of the web management page? I would like to see what is being shown. Is the temperature detected less than 35C? If it is more, the miner will lower your PLL which will reduce your hash rate.