Web61 and Web89 are both experiencing some load issues, which is causing the server loads to spike periodically and the servers to become unresponsive for short periods of time.
The problems on the two servers are actually not related, and the types of loads on each of the servers is quite different. It is only a coincidence that both of them are having similar issues at the same time.
We are actively working on fixing this problem and we will update this post when the issues have been resolved.
Update: Web61 is now fixed.
Update: Web89 is now fixed.