backend login keeps loading forever

My site has been working all the time. I havent login since Sunday and this morning when I login it is still working. I have logout and then decided to login again to check statPress overview. It starts to keep loading forever so I close my browser and clear cache and everything.

I tried to log back in and for some reason it is login after clickign login button. Login information are all correct and it keeps loading and i tried all browser.
When I go to my site fronted I can see i am login coz i can see my profile and dashboard. I clicked dashboard and it is loading.. anythting related to my backend side, it is loading.

I don’t understand what have change. I haven’t change anything and I just write articles no config has been changed so far since site was up and running.

Does anyone have this kind of problem?

Any help will be greatly appreciated.

Cheryl