[Solved] OpenWrt on MT7621/MT7615N devices with 5GHz problems

I'm trying to fix a problem I think might be related. My Linksys EA7300 V1 will stop passing network traffic on just the 2.4Ghz SSIDs Here is my saga so far but in summary it is still failing with a fresh install and minimal settings, no special firewall rules, or VLANs.
Do you think this is related?