I have Meteobridge 3.2 running on a TP-Link TL-MR3020. It's connected to a Davis Vantage Pro 2 via USB. This setup has been working admirably for 8 years. Today the rain readings started going beserk.

I assure you it is not raining 12.8 inches per hour.
The Davis Vantage Pro 2 console does not report such a rain rate.
EDIT - Sorry guys. The reed switch is failing on my rain guage.