Massive Mhs Drops

Hi,

am mining raven for a few months now on my 1080ti and i am used zu 22-24 or oc 26-28 mhs, but since today my mhs drop under 5 and my utilisation is all of the sudden almost 0.

anyone an idea whats the reason or how to fix this?

https://preview.redd.it/sydda2sbok681.jpg?width=908&format=pjpg&auto=webp&s=bff8c247cdfb9f8ae8109e587b7fb8e60fe4d2e8