Hey,
Interesting, I've got the same issue, also my site has been very slow, to getting 503 Internal Server error for the last 3 days, I've also done nothing to prompt this error, my site is on a GoDaddy Server, apparently GoDaddy have changed all the Urls to another format, something about parent and child locations, according to the help forum page of their site.
Anybody else with this issue, or with GoDaddy on a go slow to non existent site load (503 error)
Thanks.
Nick. dw7240.com