I leave my laptop on all the time and for some reason, after it's not been used for a couple of hours (or even when I've been using it for more than 3 hours at a time), when I try to click open another link, it doesn't open. It says on the bottom left hand corner: 'error on page.' My pop-up blocker is off so I am not sure what's going on. The only way I've figured out how to fix it is if I re-start the whole system. Any idea what this is from and how I can fix it?