d3 lowers its hash rate over time

Anyone had this issue? it bothers me since i bought it. Is hosted, so i cannot experiment with it. Basically the hash rate is good at first, then after about 4 or 7 days, collapses to 10k and below. Any suggestion, or a fix?

tried clockrate of -5%, then of 469mhz, and now of 437mhz...

Update. The miner was fine for 9 days but fell on the 9th day (even at 437mhz), lasted 2 days more compared to 469mhz. I have nothing but try to find some auto reboot firmware and hope the host will update that.

lost one hashboard perhaps?