Thank you iFrogMac. This occurred before I recently added a node and started using aimesh. I reported this problem to ASUS this morning using the Feedback tab in the Administration function of the RT-AX86U as I did not see any new firmware since November which introduced the bug. In the past...
I have the same problem as clownfishman. After installing this firmware via the Administration screen my Kasa EP10 smartplugs which use 2.4 ghz fail to connect so I had to back off as well.