try this settings.
disable MFP if enabled.(WLAN Service)
Disable 11k if enabled(WLAN Service)
Radio settings- advanced:
Set DTIM to 1
Enable protection RTC/CTS
Band width try maybe 20Mhz
sorry for the misunderstanding..I got it now.
I need to update both of my EWC to the newest code but tested it with the 10.51.03 and it's working for me.
If I remove the VNS from the load group it will get removed also on the WLAN Service...
I assume that you remove the VNS only under the WLAN Assignments but
the AP was still selected here under the AP Assigments within the Site..or?
Uncheck it and the radio should be available under the VNS WLAN Screen again.