Upgraded multiple devices inc CCR1009 / CRS317 / RB4011 / RB3011 / wAP AC all OK. However, I encountered an issue when upgrading my RB5009 from 7.2.3 to 7.3: it has a bonded WAN interface (Ether 2 and 3) connected to a Virgin Media HUB 4 (in modem mode). The bonded WAN interface is configured as a ...

What's new in 6.47beta54 (2020-Apr-06 06:32): Changes in this release: *) wireless - improved 5GHz interface stability on RB4011iGS+5HacQ2HnD and Audience; *) wireless - improved system stability on hAP ac^2; great news! I use v.6.46.2 and only when I activate 5GHz WiFi my RB4011 restarts once a we...

are you testing with 6.46beta44 ? In changelog:
*) wireless - improved stability when setting fixed primary and secondary channels on RB4011iGS+5HacQ2HnD-IN;
*) wireless - improved 802.11ac stability for all ARM devices with wireless;

6.45.1 didn't solve the problem. TimurA, did you reset wlan interface configuration? solved it? yes, in 6.45.1 solve mac address, 5ghz down again and again. ps I take off RB4011, and put up for sale. The problem with 5ghz will not be solved as I understand it. I upgraded my RB4011 to 6.45.1 and 5gh...

6.45.1 didn't solve the problem.

TimurA,
did you reset wlan interface configuration? solved it?