Why do I randomly have to re-enter my Password

[AndMcT]

Why do I randomly need to re-enter my email and password to use Adobe Acrobat?

My organisation has paid for it.  It worked fine two days ago.   Why do I get kicked out and asked to re-enter my password on software that has already been paid for?

And why does Adobe not remember my password and force me to reset it?

This extra 10 minutes of messing around is extremely annoying when I am just trying to simply read a document.

This is not how you should treat paying customers.

[creative explorer]

@AndMcT if this was your personal computer at home, the chances are you won't log-out of the computer, and maybe, you just put the computer sleep; but with work computers, it may be a slightly different work process. My work computer, when we log off our computer, the system wipes temporary data, including the files Adobe uses to remember our authentication token. When we log back in, the computer treats it as a brand new user. So, we need to enter the user name and password; 

Sometimes, if you clear the history, cache and cookies to the web browseer, it will also ask you to enter the username and passwords; It's a security feature; If you don't log-off the computer, you might miss important updates that the company you work for via remote updates; 

Why would it take you 10 minutes to type in a username or password; that should take seconds only.