Welcome to the forum.
Did you mean 45? If it has work properly since 2009 and is just now giving you a problem, it may need a new controller. Before going that route,, carefully clean the residue off the box probe. A dirty probe will affect the controller. Also, connecting the meat probe without setting a meat temp will cause confusion. If this does not help, send/contact CookShack tech support.
IF you recently bought this used, that may be the reason the prior owner sold it. Just a thought.