Random page not found errors

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Hi,

Just recently installed C5 5.4.2.2 on GoDaddy Linux Deluxe hosting package.

I've c5 enabled a custom design which is working fine, however when I'm navigating around in the dashboard or just randomly working within c5 I will all of sudden get a 404 error and then the site refuses to load any page whatsoever. Give it 5 minutes and it will start working again.

Is there too much load going on the GoDaddy server which has some kind of failsafe built into it?

Any ideas anyone?