RT-BE92U Persistent Thermal Zone Faults

[RicoSuave]

First post here so bear with me if I miss anything. Since purchase, my RT-BE92U has been plagued with the same issues others have posted here. Up until the new firmware version dropped, I was having constant problems with network stability. I am currently running the latest firmware version (3.0.0.6.102_37435) and a lot of the issues seem to have been resolved except for one. Before the firmware update, I was seeing intermittent thermal zone errors in the system log. Since applying the update, I am consistently getting the following errors that appear every 3 seconds exactly:

Jan 4 18:29:52 kernel: read_bpcm_reg_direct_keyhole: Wait for completion failed, devAddr 0x3, offset 24, idx 2
Jan 4 18:29:52 kernel: thermal thermal_zone0: Failed to get RAIL 0 temperature, ret=256
Jan 4 18:29:52 kernel: thermal thermal_zone0: Failed to get temperature, ret=-1
Jan 4 18:29:52 kernel: thermal thermal_zone0: failed to read out thermal zone (-1)

On occasion, the errors coincide with a drastic decrease in wireless network performance. Under normal conditions, when connected to the 6GHz network, my wireless network download speed averages around 1100Mbps. This will drop to a nearly unusable 2-3Mbps. The 2.5GHz and 5GHz networks also see a decrease in speed to around the same 2-3Mbps. Wired clients seem unaffected. Once I perform a hard reset to the router, it seems to correct the speed issue for a while, but the thermal zone errors continue to persist. This seems to happen anywhere from once a week, to every day. Performing a hard reset isn't something I want to nor should have to keep doing to correct the issue every time it happens. Please let me know if there is anything else I can do to stop this from happening. I am getting very close to returning this router and exchanging it for a different brand. Thanks.

[RicoSuave]

Good information for @Aureliannn_ASUS and their team to look into. Unfortunately, I don't see disabling the 2.5GHz radio as a viable option given that a majority of the wireless clients on my network only support the 2.5GHz Band (TVs, Appliances, etc.) 

[Asiatic_Static]

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@RicoSuave wrote:

Good information for @Aureliannn_ASUS and their team to look into. Unfortunately, I don't see disabling the 2.5GHz radio as a viable option given that a majority of the wireless clients on my network only support the 2.5GHz Band (TVs, Appliances, etc.) 

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Yep, I completely agree that disabling 2.4 GHz is not an acceptable long-term solution! My ecobee3 thermostat only supports 802.11n on 2.4 GHz, so right now it's offline. I just ordered another RT-BE92U on the chance that maybe some units have faulty hardware while others don't. If the 2nd unit has the same issues, both are being returned and I will have to go with another tri-band WiFi 7 router.

[Ckarpurk]

Asiatic you solved it for me, thank you! I followed your steps exactly and now there are no more random reboots or logs full of thermal errors. I live in a dense area with dozens of adjacent 2.4GHz networks, so disabling the 2.4GHz radio is actually preferred for my application. I can now use this router as intended until a firmware update can be released.

 CPU usage back to normalNo more thermal errors

[Pokok]

No. 

The issue will resolved temporary  after even you do nothing and just REBOOT and it will re-occurred few days later. For my case, the issue circle is like 5-7day. 

[Lid]

I cannot disable 2.4, not even acceptable short term as it will render so many devices unable to connect either due to technology or range.  My thermal issues have not return but that's only due to reducing anything that causes a load (such as my hard drives) - I have put the AC68U back as a node and it's more than happy with the drives added to it, as they were for years.   So very frustrating and disappointing.  I really wanted the kids wifi protection too and that still doesn't reliably work. One day clients will connect no problem, the next they connect but have "no internet".  I've seen from searches I am not alone with this either.  

Radio silence from ASUS on when they will have a next firmware. I have little confidence it will resolve.  Most of my issues started after the last one.