i had a clifford 300 and they are poo! it used to f*ck up like that all the time for no reason, although never in the same way yours has. Apparently they have a tendency for some sort of voltage spike in the brain of it, and it just scrambles it for good - dunno how true that it, an alarm fitter told me.
if your valet code doesnt do anything, and the fob wont work and your ignition wont come on - but at the same time the alarm hasnt actually been goin off then it does indeed sound like you are going to need an alarm fitter to have a look at it mate. good luck with it anyway.
Liam