Maybe you "fat fingered" a cell on the ve table accidentally or its pulling fuel based on iat or coolant temp if you had those prameters open at some point? It shouldnt randomly go lean for no reason, especially if you had it running good previously. Also, with c-com online and the ve table open, hit g and look for any huge spike looking spots in the 3d graph.
I agree with the post above too, if you added up the amount of time cal has spent on the phone with me vs the meager profit he probably made selling me my xfi, he probably worked for about 15 bucks an hour lol.