Thanks @SJELK. After reading your response, I sent the 828U to Benelli, via Scheels in Johnstown, CO. It's been two months and I haven't heard a thing. Scheels said it could take a few months, so I'll be patient, to a point. ; )
Also, I fully agree and echo everything in your original post. Glad you got your gun fixed. This is a widespread manufacturing defect, specific to the Benelli 828 series, and it appears frequently in gunsmithing forums worldwide. This should not be happening in a gun of this class and price point. Cheers.
To all those who posted that their 828U safety switch works just fine, I say "Good for you".
Mike B