I've noticed repeated instances of my login being dropped.

Relogin often requires opening a fresh tab to accept email/password.

Obviously this will occur if clearing one's cache, but many/all of what I've experienced have not had that as a possible cause. (Accessing another website ie the wiki, often seems to immediately prceed the issue.)

Before I initiate a trouble ticket:
  Is this something others have experienced?
  Is ther a known cause? (or better a fix?)

THX