There is a very long history of US-east-1 being horrible. Just bad. We've told every client we can to get out of there. It's one of the oldest amazon regions, and I think too much old legacy and weird stuff happens there. Use US-west-2.
Or US-East-2.
Isn't us-east-1 where they deploy everything first? And the only region that has 100% of all available services?