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I don't believe there is a problem either. Under normal conditions the security light should come on then go off if the correct key is being used. The problem could be the key switch or the neutral safety switch if it is an automatic trans. There are other possible causes.
Maybe a bad coil. Mine did this for about a month. It would skip but not all the time. It had weak spark on one side of coil and had small cracks on the coil. You should also check the rubber hose that goes to the pcv from the intake manifold as they will collapse and leak.
I had and identical problem on my 2002 Focus I also just had the alternator replaced I found my positive lead from the Battery to the starter bad it was melted by the terminal end I raplaced the wire loom that it was in (Ford part WC-95725,YS4Z-14301-LB) and so far that has fixed the problem (only been a week) I hope this helps
My opinion is that the only thing you can do is replace the ignition lock cylinder. I have seen stuck cylinders on the Ford Focus many times, and never successfully got one unstuck. This is a fairly common problem with the Focus.
It sounds as if you have a corroded or loose connection or there is a problem in the instrument cluster module.
See the instrument cluster is actually a computer module and it sounds like it is resetting either from a loss of power or ground or something is spiking it.
I would have the dealer take another look at it and have them do a network test and also check for ALL continuous memory codes to see if there isn't some network codes(U codes) stored in memory.