We have identified the root cause for increased error rates for new launches in the US-EAST-1 Region. The event affects instances which use EBS Encryption with unencrypted AMIs. Existing instances are not affected. The Availability Zone use1-az5 recovered at 9:05 AM PDT. We began seeing significant recovery in use-az6 at 10:20 AM PDT and are beginning to see recovery in use1-az2.