It is overclocked. more than likely your ASIC chips and PCB are damaged. Not much you can do at this point other than sending the PCB for repair or seek replacement.
Hi I began mining with an antminer s7 a few months ago, when I started everything went great but as time went by the antminer started to lose mining power and mi hash rate lowered I'm a beginner and I really don't know how to solve problems, but I think it has to do with the asic I'll post some screenshot, I hope someone can help me fix it
This is how it was before even there it was working at 2/3 of his capacity
And this is now I'm only getting 1.5 TH