I've had a similar issue on a HP M570DW wlan printer. I changed from WPA2/WPA3 to WPA2 only and the problem was gone.
@Syamantak Omer: Do you have WPA2/WPA3 enabled in the wlan?
I've upgraded both R720 and R510 to 200.9.10.4.233. Everything is working like before, except 'Application Visibility' isn't working anymore.
In the WLAN settings, this option is enabled, but in the services tab no more graphs are showing up (even wa...