MikroTik hAP AC Lite losing 2.4GHz network

RouterOS Wireless Networking
1

I’m having trouble with a 2.4GHz WiFi network run on a MikroTik hAP AC Lite in an apartment setting. I have both 2.4GHz and 5GHz networks configured on the router, and every few days the 2.4GHz network will become inoperative. All the devices (mostly IoT) on it lose network connectivity, and the Interface shows as "not running" in WebFig. I see the SSID in the WiFi menu on my MacBook, but when I try to join the network I get the OS X error message "The Wi-Fi network … could not be joined". If I disable the interface, wait a few seconds, then enable it everything goes back to normal. What’s going wrong, and how can I better diagnose this? I’ve attached a log file of several days of wireless logs. The last messages on wlan1 before it dies are "disconnected, group key exchange timeout". Might that be a clue?

RouterOS v6.40.5
Firmware 3.41
RouterBOARD 952Ui-5ac2nD

2

You seem to have a ACL configured? Access control list… Try disable that and see if the issue persists.

3

No ACL configured. I think the ACL-related messages are just debug-level stuff (which you normally wouldn’t see in the default logging configuration) about a blank ACL that accepts anything.