Absolutely has nothing to do with age... An upgrade just completed this summer greatly increased their sensitivity. What's happening is that during the overnight, the air near the surface cools faster than the air aloft. The inversion (same thing that lets you hear distant radio transmissions) does the same thing to radar beams, so they bounce off the inversion, hit the ground, come back, and the radar thinks it is light rain.
It's not really a big deal, as most radar software displays have a way to filter it out.
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