I upgraded from a Windows Economy server to a Linux Deluxe server, and it completely fixed all of my issues. My site has loaded perfectly ever since I upgraded. I’m not sure if the switch from Windows to Linux was the answer, or if it was the switch from Economy to Deluxe, or maybe any change in server would have fixed the issue. Whatever it was, it was a lifesaver.
Good luck. Let me know if you have other questions. I don’t know much about this stuff, but I’ll do my best to help.