also please note that support had earlier mentioned about some issues with one of their servers (i guess the one which has some india connection). This was in response to the same problem on another blog of mine. But problems continue since many weeks.
According to me it cannot be a connection issue. This happens only with blogs with wordpress.com in their domain name. Nothing else at all.
Support always gets back promptly saying - there was server issue earlier, now it seems to be resolved. send the ping reports.
What's the point ? Sometimes it happens every 5 mins or sometimes hours later..