FWIW, there are two separate threads [0] [1] on the outages mailing list [2] (starting at ~1719 UTC) discussing AWS issues.
status.aws.amazon.com [3] reports everything is normal, however.
There's also been reports of more widespread issues, affecting Youtube, Reddit, and Twitter.
[0]: https://puck.nether.net/pipermail/outages/2016-April/008942.html
[1]: https://puck.nether.net/pipermail/outages/2016-April/008943.html
[2]: https://puck.nether.net/mailman/listinfo/outages
[3]: http://status.aws.amazon.com/