PROBLEM ACCESSING WEBSITE Errors

Error 324 (net::ERR_EMPTY_RESPONSE): The server closed the connection without sending any data.

OK for some reason once I log in and do a few bits and bobs the error above happens in chrome in ie9 it just says can't help u please bugger off.

if I clear my recent history i can get it to work till it happens again

anyone got a clue? happening on http://www.shopezy.co.nz and http://www.ezywebsites.co.nz

which are both the main sites