You are no longer signed in

After about 5 minutes of work, I'm no longer able to save my work. I receive an error message that I'm no longer signed in. It's as if my login times out every 5 minutes. What's up with that?

Pertaining to the District 40 website

What site?
What are you trying to do?
What error are you seeing before your get the nolonger logged in?

It's pertaining to the District 40 website. d40.toastmastersdistricts.org/
I am updating the site and building custom pages.
I get no prior notice or error. It's when I press SAVE that I receive the No Longer Signed in message.

Does anyone else have the site admin password?

yes

There can only be one site admin logged in at anytime. That includes using multiple browsers on same computer.
I suggest you try changing the password to make sure no one else is kicking you out.