Check in Control Panel->Peformance and Maintenance->Administrative Tools->Computer Management->Event viewer to see if you are getting any errors. A 3-5 minute shutdown will generally cause an event to be logged.
Many sites are poorly designed regarding java script. If only a few sites are giving you this problem, you can alway uncheck the 'display notification about every script error, and check the ' turn off script debugging ' in Tools->Internet Options->Advanced. Scroll down to the Browsing section.
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