Wheel Of Fortune from email subscriptions has an expiration period of 48 hours, if you don't claim it within that period it will expire but Wheel of Fortune from Premium Membership doesn't have a period of time you can play it at any time. Tried exchanging RP with 1 WoF and didn't experience any problems being able to spin it right away.
Try closing the browser and clicking the WoF link again from the email if you experience the same problem, as it seems to be on your internet connection.