I have a re-occuring issue where the 5GHz connection on my TP-LINK WDR3600 (to my main router, the TP-LINK Archer C7) stops working. In LuCI the interface shows as "Disabled" and the only resolution is to restart the WDR3600.
The main router works fine on all other devices - including on the 5GHz frequency - so I assume from this limited diagnosis, the problem is not on the Archer C7.
I ran logread on the WDR3600 and got the following:
Sun Aug 19 18:52:50 2018 kern.info kernel: [86482.353518] wlan1: deauthenticated from 1[MAC address removed] (Reason: 2=PREV_AUTH_NOT_VALID)
Sun Aug 19 18:52:50 2018 kern.info kernel: [86482.362107] br-lan: port 3(wlan1) entered disabled state
Sun Aug 19 18:52:50 2018 daemon.notice netifd: Network device 'wlan1' link is down
Sun Aug 19 18:52:52 2018 kern.info kernel: [86484.379661] wlan1: authenticate with
Sun Aug 19 18:52:52 2018 kern.info kernel: [86484.394345] wlan1: send auth to (try 1/3)
Sun Aug 19 18:52:52 2018 kern.info kernel: [86484.402122] wlan1: authenticated
Sun Aug 19 18:52:52 2018 kern.info kernel: [86484.413809] wlan1: associate with (try 1/3)
Sun Aug 19 18:52:52 2018 kern.info kernel: [86484.421209] wlan1: RX AssocResp from (capab=0x11 status=0 aid=2)
Sun Aug 19 18:52:52 2018 kern.info kernel: [86484.429335] wlan1: associated
Sun Aug 19 18:52:52 2018 daemon.notice netifd: Network device 'wlan1' link is up
Sun Aug 19 18:52:56 2018 daemon.notice netifd: Network device 'wlan1' link is down
Sun Aug 19 18:52:56 2018 kern.info kernel: [86488.428960] wlan1: deauthenticated from (Reason: 2=PREV_AUTH_NOT_VALID)
Sun Aug 19 18:52:58 2018 kern.info kernel: [86490.449752] wlan1: authenticate with
Sun Aug 19 18:52:58 2018 kern.info kernel: [86490.464445] wlan1: send auth to (try 1/3)
Sun Aug 19 18:52:58 2018 kern.info kernel: [86490.472260] wlan1: authenticated
Sun Aug 19 18:52:58 2018 kern.info kernel: [86490.483724] wlan1: associate with (try 1/3)
Sun Aug 19 18:52:58 2018 kern.info kernel: [86490.491166] wlan1: RX AssocResp from (capab=0x11 status=0 aid=2)
Sun Aug 19 18:52:58 2018 kern.info kernel: [86490.499288] wlan1: associated
Sun Aug 19 18:52:58 2018 daemon.notice netifd: Network device 'wlan1' link is up
Sun Aug 19 18:53:02 2018 daemon.notice netifd: Network device 'wlan1' link is down
This repeats over and over again. Can anyone help?