I did a quick check of the logs for the suspensions, but they didn't reveal any conclusive information about what exactly is causing it, other then it is something with the blog. Log indicates index itself, which usually means it is a plugin that loads with every page load. It is CPU that keeps going high, highest note I saw was 300, which means your account were using 3 full CPU's.
Also the number of open processes increased with each entry, to a certain point, which would suggest some processes are executing rather slow so there's more concurrent ones then there'd normally be, causing the total cpu to go that high.
This could be related to some ongoing maintenance (clearing out inactive accounts), which would cause slowness/high load on the servers, and thus explaining why there's so many processes started at the same time. Since you say the problem came back today, that does fit the timeline. The maintenance process was started sometime in the last 24 hours from what I can find out, but I can not say with certainty how long it is gonna take to be fully executed.