After about three months since my original post on this thread, I've finally been able to bury this problem, and thought I'd follow up in case anybody's interested.Fed up with the lack of transparency, I eventually requested a refund rather than goin...

I've created an account here to contribute to this thread.In my case, my pairing is a B550-I (Part No. 90MB1E10-M0EAY0), which is still within warranty, plus a brand new ASUS TUF GAMING RTX 4070 Ti Super. I share similar observations with some others...