Summary says it all, the API is occasionally not giving the information, therefore causing issues with my programs that use this info. If you don't believe me, click this a couple times: https://sessionserver.mojang.com/session/minecraft/profile/43ebc0fde66a43f2a8e0d300d7e4edb6
Eventually you will receive something along the lines of this: http://puu.sh/a5IvV/21d4cd85f3.png