Hi guys,
I got a new duet wifi from filastruder and set it up with the latest firmware based on my old settings. Printing has been flawless. I put another 15 hours or so of printing and had no missed steps at all.
So apparently it was the old duet board. I'm happy with that. My biggest fear is that I would replace the board and find out that wasn't the problem.
I'm also pleased with the external antenna version that I got vs the onboard antenna version I had from 2017. My printer is metal and I made a mistake of buying the internal one. My connection to the network has been much more reliable. Im a happy printer.
Thank again for all the ideas and feedback you guys gave me. Hopefully this thread will be of help to someone in the future.
Here is to another 3000+ hours!