Just a thought: what Operating System are you running? If Windows XP, then try turning off the auto reboot 'feature', so you can actually read the error message (aka Blue Screen of Death) for the crash, giving you more clues to work with.
Look HERE to see how to do that.
If my rig repeatedly crashed AND my 'net connection kept slowing down, I'd suspect some mal-ware infection, and run Antivirus software.
As the fellas above recommended, I'd first look at hardware (memory, voltage, etc) first.
Bookmarks