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This may be costly and time consuming, but return the car to stock. See if the problem still procists, if it does st least you can eliminate the mods causing the issue. If the problem goes away, then add your mods one by one, until you figure out which one causes the issues.
That's what I would do, not the most efficient way but worth a try. Also if the car is stock and issue persists you can take it to the dealer if you still have warenty
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