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While in Cruise Control, Dynamic (Radar) at about 70 mph, for no apparent reason a chime will ring 4 or 5 times and the car will slow down dramatically (brakes) to about 60 mph, only to aggressively speed back up to 70.

It may repeat this several times until I just hold the accelerator to hold speed.

Weather, sunny and dry.

Traffic, often NONE!

Sporadic.  it may go months without a re-occurrance.

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can only think that the radar is contaminated with dirt or dust which may be inhibiting the readings or alternatively, there could be some Radio frequency interference affecting it (if it occurs on the same stretch of road each time?)

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