Vizio PX65-G1 Dolby Vision Issue

[TwinCitiesBluFan]

Okay, I'm having an extremely frustrating issue with my Vizio PX65-G1 TV that I can't figure out, so I'm hoping someone here will know more.

When playing Dolby Vision content from Netflix, the picture is unwatchable as the colors go completely wonky. It's like the picture goes negative, but instead of black and white like negative photo, it's like a coral and blue in the negative effect and is literally not watchable.

I looked up a list of Dolby Vision content on Prime Video so I could test in that app and didn't get the same issue, but seems like different problem there. On one of them (Tom Clancy's Jack Ryan Season 1), I get an error saying "Something went wrong. Please try again later. For more help, go to amazon.com/videohelp." and on the other (Suspiria - 2018), it plays, but it seems VERY dark. When the video starts playing on that one, it says HDR10+ in the upper-right corner and I can hear richer sound, but the darkness can't be right.

Other streaming content, DVDs, BDs, and 4K discs are all fine to my eyes, but something is clearly wrong with Dolby Vision/HDR streaming content. My online searching didn't come up with anything definitive, sadly. Anyone seen this or have any insight into how to fix??