New here. But I just purchased a Whistler Xtr - 690 Detector in New Zealand.
Its a good detector however it is hardwired and about every 30th start of the engine it will perform a factory reset.
Ive been told by the dealer that it is a power issue, so Ive moved the power source from the radio to the dome light.
The hardwire cable is not genuine but Ive tried two different ones.
You can set all your settings again. And it will do it after aprox 30 starts.
WHistler also emailed me and said that they cannot explain the problem, and that it will not be covered by warrenty.
I am a little but suspect about the voltage measurments I took. 14Volts car not running, 17 volts running. Seem a bit high to me. There is also no measurable spike when starting.