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I'm on factory firmware since 2016.

AC-88U's 5ghz just turned off and 2.4ghz is now running at download speed of 2.84Mbps and upload speed of 0.92Mbps despite me being just beside the router; on a 1gbps unlimited plan.

Have tried to restart Optical Network Terminal & router to no avail.

Below is the extracted info from general log:
Dec 9 02:13:05 rc_service: ntp 1147:notify_rc restart_diskmon
Dec 9 02:13:05 disk_monitor: Finish
Dec 9 02:13:08 roamast: ROAMING Start...
Dec 9 02:13:09 disk monitor: be idle
Dec 9 02:13:09 syslog: event: wl_chanspec_changed_action
Dec 9 02:13:09 syslog: skip event due no re
Dec 9 02:13:22 kernel: SHN Release Version: 2.0.2 3a73e78
Dec 9 02:13:22 kernel: UDB Core Version: 0.2.20
Dec 9 02:13:22 kernel: sizeof forward pkt param = 192
Dec 9 02:13:22 BWDPI: fun bitmap = 5ff
Dec 9 02:13:25 watchdog: start ddns.
Dec 9 02:13:25 rc_service: watchdog 420:notify_rc restart_ddns watchdog
Dec 9 02:13:25 A.QoS: qos_count=0, qos_check=0
Dec 9 02:13:27 start_ddns: update WWW.ASUS.COM update@asus.com, wan_unit 0
Dec 9 02:13:27 start_ddns: Clear ddns cache.
Dec 9 02:13:27 start_ddns: Start Inadyn(5).
Dec 9 02:13:28 inadyn[1747]: In-a-dyn version 2.8.1 -- Dynamic DNS update client.
Dec 9 02:13:28 inadyn[1747]: Failed resolving hostname B51D9244C5843522EEE922FBFC400608D.asuscomm.com: Name or service not known
Dec 9 02:13:28 inadyn[1747]: Update forced for alias B51D9244C5843522EEE922FBFC400608D.asuscomm.com, new IP#
Dec 9 02:13:30 A.QoS: qos rule is less than 22
Dec 9 02:13:30 A.QoS: restart A.QoS because set_qos_conf / set_qos_on / setup rule fail
Dec 9 02:13:30 inadyn[1747]: alias address=<>
Dec 9 02:13:30 inadyn[1747]: request<GET /ddns/update.jsp?hostname=B51D9244C5843522EEE922FBFC400608D.asuscomm.com&myip=&model=RT-AC88U&fw_ver=3.0.0.4.386_48263-g80b7325 HTTP/1.0^M Authorization: Basic MUNCNzJDNzZEQzg4OkE5MUMxNDA3RjQ1MkMwQzhBNDBDODVFMjkwMzI3NEU3^M Host: ns1.asuscomm.com^M User-Agent: inadyn/2.8.1 https://github.com/troglobit/inadyn/issues^M ^M >
Dec 9 02:13:30 inadyn[1747]: [response_update]HTTP/1.1 299 |Invalid IP format| ^M Date: Fri, 08 Dec 2023 18:13:30 GMT^M Server: Apache^M Content-Length: 0^M Connection: close^M Content-Type: text/html; charset=UTF-8^M ^M
Dec 9 02:13:30 inadyn[1747]: Invalid IP address
Dec 9 02:13:30 inadyn[1747]: Fatal error in DDNS server response:
Dec 9 02:13:30 inadyn[1747]: [299 |Invalid IP format| ]
Dec 9 02:13:31 A.QoS: qos_count=0, qos_check=1
Dec 9 02:13:35 A.QoS: qos rule is less than 22
Dec 9 02:13:35 A.QoS: restart A.QoS because set_qos_conf / set_qos_on / setup rule fail
Dec 9 02:13:36 dhcp client: bound 1 via for 600 seconds.
Dec 9 02:13:43 crond[413]: time disparity of 2942708 minutes detected
Dec 9 02:14:45 ahs: [read_json]Update ahs JSON file.
Dec 9 02:14:56 WATCHDOG: [FAUPGRADE][auto_firmware_check:(7630)]periodic_check AM 4:28
Dec 9 02:14:56 WATCHDOG: [FAUPGRADE][auto_firmware_check:(7669)]do webs_update
Dec 9 02:14:56 hour monitor: ntp sync fail, will retry after 120 sec
Dec 9 02:17:03 acsd: COEX: downgraded chanspec 0x1906 to 0x1008: channel 1 used by exiting BSSs
Dec 9 02:17:03 acsd: selected channel spec: 0x1008 (8)
Dec 9 02:17:03 acsd: Adjusted channel spec: 0x1008 (8)
Dec 9 02:17:03 acsd: selected channel spec: 0x1008 (8)
Dec 9 02:17:03 acsd: acs_set_chspec: 0x1008 (8) for reason APCS_INIT
Dec 9 02:17:04 syslog: wlceventd_proc_event(527): eth1: Auth 6A:48:DB:43:52:A6, status: Successful (0), rssi:0
Dec 9 02:17:04 syslog: wlceventd_proc_event(527): eth1: Auth 6A:48:DB:43:52:A6, status: Successful (0), rssi:0
Dec 9 02:17:04 syslog: wlceventd_proc_event(537): eth1: ReAssoc 6A:48:DB:43:52:A6, status: Successful (0), rssi:0
Dec 9 02:17:11 roamast: ROAMING Start...
Dec 9 02:17:31 syslog: wlceventd_proc_event(527): eth1: Auth 42:28:A6:A2:65:86, status: Successful (0), rssi:0
Dec 9 02:17:31 syslog: wlceventd_proc_event(556): eth1: Assoc 42:28:A6:A2:65:86, status: Successful (0), rssi:0
Dec 9 02:18:17 rc_service: cfg_server 4086:notify_rc restart_wireless;
Dec 9 02:18:24 syslog: main(961): wlceventd Start...
Dec 9 02:18:24 syslog: wlceventd_proc_event(556): eth1: Assoc 42:28:A6:A2:65:86, status: Successful (0), rssi:0
Dec 9 02:18:25 acsd: COEX: downgraded chanspec 0x1906 to 0x1008: channel 1 used by exiting BSSs
Dec 9 02:18:25 acsd: selected channel spec: 0x1008 (8)
Dec 9 02:18:25 acsd: Adjusted channel spec: 0x1008 (8)
Dec 9 02:18:25 acsd: selected channel spec: 0x1008 (8)
Dec 9 02:18:25 acsd: acs_set_chspec: 0x1008 (8) for reason APCS_INIT
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