Both the OS headlamp unit and the radio interference suppression relay share the same ground point 31/2, located near the OS head lamp unit. Might be worth a check. If the ground point is overloaded due to bad contact with all the current going to the headlamps, the RISR might fall off.
Or give the RISR an auxiliary ground wire directly to the battery and see if that solves the flashing / dead engine issue.
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