Might have been an issue with the sensor connection during install. Not sure you can just "look" at a sensor to see whether there is a problem with it.

Two years ago I replaced the windshield on my E46 with one from PGW (spin off automotive arm of PPG). I've had no issues with it. Once in a while I get a mysterious dry wipe which is always fixed by turning it off and back on again. It's never failed to work when it was wet.

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Wake up every day that would be a start.