Check the wiring going into the inertia switch!. Easiest way is to remove the glovebox to get right into the wiring (4 torx screws at top, 3 hidden under mat in glovebox). Press the rubber button on top and you should feel a small straight gap, thats where the switch would pop up!. Now make sure the wiring connector is TIGHT.
I had the same symptoms and this was the culprit.....like you say, drives you nuts!
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