Yes. My blog, and all my websites, have been delivering a lot of 503 error codes recently. When the error appears on my blog it also means that boomershoot.org, modernballistics.org, xeniajoy.com, scottfamilyplace.org and others are all doing the same.
When I last talked to tech support about this they said it was because I am getting more than 500 simultaneous connections. My logs from just the first four days of May show over 3000 “GET” requests for “wp-login.php” from nearly 1000 IP addresses. I read this as my blog is under attack.
I’m not convinced my logs are showing me everything.
I’ll investigate more this week.