The AR9845 is your card on the Ultrabook. I know that there were some issues previously, but most of them seem to be gradually getting fixed with kernel updates. Have you been running yum update frequently?
It's possible that it's a NetworkManager issue, but I don't use NM, so can't be of any help with that. For what it's worth, I have the Ultrabook UX31E with the same wireless card, and lately, at least, it's been working well for me on Fedora.
indicates that kernel updates are helping folks with any wireless issues.