R7 FW 1.52 - GPS inconsistent

I upgraded my R7 the other day to Uniden's official 1.52 firmware. Ever since, I've noticed the GPS speed readout on the detector is very inconsistent. For example, I'll have cruise set for 55mph. This is confirmed on my phone running HWR. The R7 might read 58, will shoot up to 61, drop back to 56, and repeat this. Detector is mounted in the same location. Running 1.46 was always stable.

FW was installed using recovery mode, detector was factory reset after the upgrade.

Wondering if anyone...

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