I see the same IP's from many countries. [1] They likely use Anycast and perhaps some regions are having a routing issue. Just guessing. It's working fine for me in the Rocky Mountains. Not seeing anything odd
aside from announcing bogons in looking glass but I also don't know what stats are normal for them.
Perhaps someone here has a 1keyes account and could plug them in ad-hoc?
[1] - https://www.whatsmydns.net/#A/amazon.com