@Martin2121 Just sharing my setup now.. Off 6 GHz since I don't have device using this. 5 GHz on Channel 44, 160 MHz, Medium power 2.4 GHz Auto, Auto, Medium power. Reboot EB810v and HB710 after...

@Martin2121 Try changing the Mode for the 5 GHz to 802.11a/n/ac/ax mixed (without the be) Channel width (Auto or 160 MHz) Channel (Auto or 44 / 100)