Are you saying that the "Stop" option is grayed out? or the whole "Instance State" category?
Either way, it's unusual. However, I have seen some weird behavior before if the AWS API is acting out.
one thing to try, is another browser first, to see if it's a UI issue. Other than that, if the machine is currently in a full running state or it's pending a stop, you will want to either post in the AWS EC2 forum: https://forums.aws.amazon.com/forum.jspa?forumID=30
Or open a ticket/chat with support.
If your instance is on faulty underlying hardware, and it is in fact in a (Stopping...) state, it could take a while before it's fully stopped, and even AWS support will tell you to wait it out, as they can't do a whole lot about it.
Either way, it's unusual. However, I have seen some weird behavior before if the AWS API is acting out.
one thing to try, is another browser first, to see if it's a UI issue. Other than that, if the machine is currently in a full running state or it's pending a stop, you will want to either post in the AWS EC2 forum:
https://forums.aws.amazon.com/forum.jspa?forumID=30
Or open a ticket/chat with support.
If your instance is on faulty underlying hardware, and it is in fact in a (Stopping...) state, it could take a while before it's fully stopped, and even AWS support will tell you to wait it out, as they can't do a whole lot about it.