No I have not.
They (gm) did some "improvements" for the '24's. Maybe the 'improvements" weren't!
Are you saying your Dad's dealer has 500 of them down, or gm customers, nationwide?
You could also have them look at Bulletin 22-NA-027 and see if your camshaft cover serial number falls into a bad design.
See attached bulletin. You could inspect it yourself.
I believe it a combination of things, temp and speed. But the ecm at the end of the day. There is a plastic motor mounted on the left radiator support, that opens and closes the louvers, sorry, shutters.
If'n you have something like the launch, it has the ability to command them open and closed...