Flexor - thanks for your original post...nice to know I'm not alone.
O'Briens replaced my screen with a non-OEM (it was an insurance job). My dealer 'reset' the wipers but this did not fix it. Have spoken to O'Briens and they are sending a guy out this Friday to take a look.
Will let you know the outcome.
BTW - the dealer told me the OEM screens come with the sensor bracket attached whereas the non-OEM screens don't have the bracket. So O'Briens need to remove the bracket and stick it onto the new screen.

