Sorry to hear that, Brad. Chck your power supply and look at updating/reinstalling the firmware. I had errors pointing me to a broken 1080TI back at times when I used 2 of them in a SLI installation. Finaly it turned out to be a broken power supply (that still worked with another card that did use less power).
It's also important to look at the power supply when going for a 3090.
I wonder how much of a fps increase a 3090 would give me, if core 1 is exhausted as is the case with my P3D installation. I will not go for 8K. A3090 will for sure help with 8x SSAA sampling.
Also I'm a bit sorry for my 2080TI that is now sort of almost rendered useless given there is a 3070 that is faster and costs 1 3rd of the list price I paid for the 2080TI one year ago. (Ha ha, a GPU is "rendered" useless, how funny is that?). Well, there is still 3 more GB of VRAM in the 2080TI.
So, I'm not in a hurry to upgrade, both sims are running fine.
Anyway, now is a good time to get cheap used cards.
Karl