Most of us use our race tunes as the base file..but as you said i do not see why it resort to the whole file?? Mine just normally used the limiters ect.
thats what i'm getting at i could see limiters and such but i too use my race as the base tune and i couldn't see it totally reverting unless the switch or pins in the ecm were jacked.
if hes getting the same PW as he does on his race tune while its cold and hes on a different slot something is up...