I think you are referring to when you are "browsing" - please confirm.
Some browsers (such as IE and Firefox) will put out a message of that sort if something goes wrong when you are online. It allows you to either start back at your home page or to return to the website you were previously viewing. It is always best to quote exact messages that pop up.
Assuming the above is the case, we need to know what browser you are using and some idea of the events that lead up to this situation. It could be a browser issue or a temporary disconnection.
How to know you are getting old 2:
Your feet seem further away from your hands