Same here for ignition switch. One car had the interior lights staying on all the time. Another car, the AC and the radio would not work sometimes after starting the car, other times they were fine.
Given your history with your immobilizer, it certainly cannot be dismissed and may well be the reason your experiencing your issues. If you haven't changed your ignition switch, its a $15 part that seems like a PIA to replace (the first time) but really isn't too bad after all.
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