Members unable to access and/or navigate site

Hello,

Many of my members are having the following issues using various mobile phones:

- Unable to log in the site even though they have logged in on a daily basis recently.

- able to log into the site, however once on the site unable to stroll the page.


It is becoming more widespread with over 60% of our members being unable to access or navigate the site wherein the issue was not present recently. No changes have been made and we even tried restoring a previous version through our backup, yet the issue remains.

Site: www.the-apoclaypse.nstars.org

Any insight to this issue will greatly appreciated.