i used the Mac wireless diagnostics which suggests the best 2.4/5 channels to use, and verified with the survey tool in asus config. also tried multiple different channels.
sidenote, this lowered my wifi speed to about half, but that may be completely unrelated and random issue. speeds went back...
I tried switching to multiple unused channels, and still have the same issue. I'm not sure what you mean by narrow bands?
Also, if it was a channel interference issue wouldn't the lan to wifi connections as I mentioned not work also?
I'm having an issue with connectivity between wifi clients, for example ssh from MacBook to raspberry pi wifi or airplay from iPhone to smart TV only works about 50% of the time. retrying to connect to the same device eventually works after many attempts, and not specific to any individual...