First off, there's a folder in the Windows folder called "Offline Web Pages" which deals with the offline web pages.
Secondly, you also need a history entry for the page you store offline to access it again. If it's greyed out, then that most likely causes the offline viewing problem.
Thirdly, I want to know why it restarts for no reason, as it shouldn't - not even once every month or so. This is fishy, and you should try to work out the reason.