5ghz just presumedly 'dead'

[evolute8]

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_check7630)]periodic_check AM 4:28
Dec 9 02:14:56 WATCHDOG: [FAUPGRADE][auto_firmware_check7669)]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:48B:43:52:A6, status: Successful (0), rssi:0
Dec 9 02:17:04 syslog: wlceventd_proc_event(527): eth1: Auth 6A:48B:43:52:A6, status: Successful (0), rssi:0
Dec 9 02:17:04 syslog: wlceventd_proc_event(537): eth1: ReAssoc 6A:48B: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

 

[evolute8]

This would be from the wireless log:

SSID: "Home-2.4Ghz"
noise: -84 dBm Channel: 8
BSSID: ??? Capability: ESS ShortSlot RRM
Supported Rates: [ 1(b) 2(b) 5.5(b) 6 9 11(b) 12 18 24 36 48 54 ]
VHT Capable:
Chanspec: 2.4GHz channel 8 20MHz (0x1008)
Primary channel: 8
HT Capabilities:
Supported HT MCS : 0-32
Supported VHT MCS:
NSS1 Tx: 0-11 Rx: 0-11
NSS2 Tx: 0-11 Rx: 0-11
NSS3 Tx: 0-11 Rx: 0-11
NSS4 Tx: 0-11 Rx: 0-11

Interference Level: Acceptable
Mode : AP Only

Stations List
----------------------------------------
idx MAC Associated Authorized RSSI PHY PSM SGI STBC Tx rate Rx rate Connect Time
F8:4D:89:5C:02:ED Yes Yes -43dBm n No Yes No 5.5M 26M 00:15:07

SSID: "Home-5GHZ"
noise: -92 dBm Channel: 165
BSSID: XXX Capability: ESS RRM
Supported Rates: [ 6(b) 9 12(b) 18 24(b) 36 48 54 ]
VHT Capable:
Chanspec: 5GHz channel 165 20MHz (0xd0a5)
Primary channel: 165
HT Capabilities:
Supported HT MCS : 0-31
Supported VHT MCS:
NSS1 Tx: 0-11 Rx: 0-11
NSS2 Tx: 0-11 Rx: 0-11
NSS3 Tx: 0-11 Rx: 0-11
NSS4 Tx: 0-11 Rx: 0-11

Interference Level: Acceptable
Mode : AP Only

Stations List
----------------------------------------
idx MAC Associated Authorized RSSI PHY PSM SGI STBC Tx rate Rx rate Connect Time

 

[L&LD]

RT-AC88U with 8 Ports?

Are you using all 8 LAN ports?

 

[evolute8]

RT-AC88U with 8 Ports?

Are you using all 8 LAN ports?

Yes the router with 8 ports.

Only using 1 port for IPTV & 1 more for powerline adapter/extender

 

[L&LD]

Are the Ports you're using Ports 5-8? See if using only Ports 1-4 makes a difference.

Of course, you will need to do some things to your router first.

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Try an electrical reset (see link above).

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Perform a full reset on the router using the appropriate method for your model from the link above.

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Am I all set to start fresh with the latest stable release? And a request for L&LD...

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L&LD

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Using the links above (if needed), perform a minimal and manual configuration of your router after you have fully reset it. Do not import any saved backup config file. Do not plug in any USB drive that was previously used for amtm/scripts.

Be sure you test the radios at each stage and keep testing them with each configuration change you perform. After each change, be sure you are rebooting the router to test/ensure that it keeps working as expected and the settings you change, 'stick'.

If after doing the above (and possibly, attempting the Nuclear Reset in the links above) the router still shows no signs of usable RF in the two bands, I would be comfortable knowing it was a hardware issue. Time for a new router then.