Parking brake fault!

[watoowatoo]

I was going high speeds on the highway with little bit of rain and suddenly Parking brake fault was flashing on the dash and iDrive. It was pretty terrifying for a sec. Although I pulled over and tested the parking brake and it was working normally.
Parking brake had a problem last winter too and BMW changed the parking brake switch and after it was all good till now.
I wonder if this has to do with some safety sensors which throw fault when they get cold or wet. Anyone had any experience on this?