Ok well given that I think we can rule out unmarried modules ect Sounds like a sus battery to me, I had an issue once where the car would start 9/10 times then just go click click. Was an auto, weird thing was after a jump start you could turn it off straight away, then like magic it would start. No way its had a chance to charge so cant be battery right? Well it was, collapsed cell apparently. Changed it and nothing else, never had a problem again. My FG did heaps of weird sh*t when the battery was closed to dead, asking for icc codes, transmission not in park bullsh*t ect..the electronics in these cars are sensitive to battery voltage, seems to reach a point where they just loose their mind so to speak. If you have a known good battery to test with id be ruling it out first cause you can do your head in over something simple.