Can't get to my drupal website late night

for the 2nd time in 2 nights, i cannot reach one of my DH sites late at night. all of my sites are Drupal 7; they are all constructed with similar modules, themes. but one site has suddenly decided to refuse me access late at night. it’s past midnight (Portland, OR) and a site i could get to easily a few hours ago now gives me a 324 error.

No data received
Unable to load the webpage because the server sent no data.
Error 324 (net::ERR_EMPTY_RESPONSE): The server closed the connection without sending any data.

this is weird.

Could be the socket handler is failing in your browser. Try loading the site with a different browser next time you get an Error 324.