This is an awareness message. When you are logged in using the Internet connection, you experience the need to re-login again in order to use the Internet. Here's why and when it happens:
After 20 minutes of being 'idle'
When our system detects that you are logged in but you are not doing anything with the Internet for a period of 20 minutes; the system will log you out and you will be required to re-login again.
We hope this awareness message explains and clarifies why sometimes you will experience being logged out, and needing to re-login again.