Thanks for the lead to the other thread. No definitive answers there, but it does give me a couple of clues to go work on

Also reassuring that I'm not alone on this odd and annoying problem

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X5 3.0i Sport - Brembo rotors, Hamann Exhaust, custom Xenon & AE lighting, Retrofit Bluetooth
Z4 3.0i Roadster
CJ10a Jeep
TJ 'Challenge' Jeep