ASUS RT-AC87U WiFi client association failures?

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I'm trying to troubleshoot some issues with intermittent wifi connectivity. After a few days of the router being up (10 days currently), my Raspberry Pi 4, running the latest Libreelec OS, will lose 5Ghz connection and fail to associate. If I reboot the pi it still won't connect however rebooting the router solves it. The router is on merlin firmware 384.13_10.

I don't see anything related in the router log despite it being set to:
Default message log level : debug
Log only messages more urgent than : all

Am I to assume the device is not attempting to associate?

This is what I see in the journalctl:

wlan0: CTRL-EVENT-ASSOC-REJECT bssid=00:00:00:00:00:00 status_code=16
wpa_supplicant[367]: wlan0: CTRL-EVENT-SSID-TEMP-DISABLED id=0 ssid="myssid" auth_failures=1 duration=10 reason=CONN_FAIL

Any help with this would really be appreciated as I've been googling and trying different things for a the last three months now!

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