Upgraded from
3004.388.6_2 and had problems specifically with Roomba J7 devices. I have two of them. They would not stay connected to the 2.4 Ghz AP. They would connect and disconnect in an endless loop every few seconds. Showing only 1Mbps TX and RX rate when connected. A factory reset was done on the router but no change in behavior. Flashing back to 388.6_2 from 388.7 instantly solved the issue.
Logs show this on repeat: with disconnect being for unspecified reason
May 16 23:03:45 wlceventd: wlceventd_proc_event(645): eth6: Deauth_ind B8:2C:A0:E3:2E:68, status: 0, reason: Unspecified reason (1), rssi:0
May 16 23:03:45 wlceventd: wlceventd_proc_event(685): eth6: Auth B8:2C:A0:E3:2E:68, status: Successful (0), rssi:0
May 16 23:03:45 wlceventd: wlceventd_proc_event(722): eth6: Assoc B8:2C:A0:E3:2E:68, status: Successful (0), rssi:-62
May 16 23:03:45 hostapd: eth6: STA b8:2c:a0:e3:2e:68 IEEE 802.11: associated
May 16 23:03:45 hostapd: eth6: STA b8:2c:a0:e3:2e:68 RADIUS: starting accounting session 62E2558BA645DF43
May 16 23:03:45 hostapd: eth6: STA b8:2c:a0:e3:2e:68 WPA: pairwise key handshake completed (RSN)
May 16 23:03:45 wlceventd: wlceventd_proc_event(645): eth6: Deauth_ind 80:8A:F7:00:0C:80, status: 0, reason: Unspecified reason (1), rssi:0
May 16 23:03:45 wlceventd: wlceventd_proc_event(685): eth6: Auth 80:8A:F7:00:0C:80, status: Successful (0), rssi:0
May 16 23:03:45 wlceventd: wlceventd_proc_event(722): eth6: Assoc 80:8A:F7:00:0C:80, status: Successful (0), rssi:-42
May 16 23:03:49 wlceventd: wlceventd_proc_event(645): eth6: Deauth_ind B8:2C:A0:E3:2E:68, status: 0, reason: Unspecified reason (1), rssi:0
May 16 23:03:49 wlceventd: wlceventd_proc_event(685): eth6: Auth B8:2C:A0:E3:2E:68, status: Successful (0), rssi:0
May 16 23:03:49 wlceventd: wlceventd_proc_event(722): eth6: Assoc B8:2C:A0:E3:2E:68, status: Successful (0), rssi:-63
AP settings are as follows: