Do you get good signal strength and throughput with the devices (putting aside that report) ?
You say no extra signals from the neighbours - but have their channels changed?
Any other sources of interference?
Have you used a Wi-Fi analyser app ? If not do a scan in various places around the property - preferably with one that shows noise as well as channel occupancy - Netspot and inSSIDer are available free for Windows (and Netspot for Mac) and various free ones for Android.
See if changing channels helps...
Are wired connections OK?
------------------------------------------------------------------------------------------------------------------------------
I know a bit about Wi-Fi, Telecoms, and TV as I used to do it for a living but I'm not perfect so don't beat me up... If you make things you make mistakes!