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Sounds like you have an electrical issue. My M3 had issues starting and acted weird at times when cranking it up, turned out to be a loose ground wire.
My current Jeep went bonkers 2000 miles after I bought it, doing all sorts of weird stuff like your last post, all random but all electrical. They couldn't find anything specific, but loosened and tightened all the connections and it went away.
Both times, seemingly severe issues turned out to be loose cables. I hope that is all you're dealing with, an electrical issue. Saw some similarities so figured I would share what I experienced. Good luck getting this figured out.
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SOLD - 2013 1LE - Pat G Spec'd Cam, NPP with 1 7/8" Long Tube Headers with High Flow Cats, Intake w/scoop, Ported Throttle Body, and Apex 1.25" Lowering Springs.
J-Rod Built and Matt@FSP Tuned

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