Not able to login to Wiki

Not able to login to Wiki

The last several weeks I am having problem logging into the Wiki platform to update our content.  While it works on Mondays - Friday, recently every weekend I can't login.

The login keeps going back to the opening page of the Wiki.  I have tried using Chrome, Firefox, and Opera but none can login whereas on Monday it works without any issues.

Is the Zoho team doing maintenance on weekends and taking the login server offline?  It can't be coincidence that every weekend I have the same problem.