Strange Issue with RT-AC88U after Firmware Flash

[dsring]

I recently flashed my RT-AC88U with Asus firmware version 3.0.0.4.384_10007. Shortly thereafter, I lost both wireless bands and my upload/download speeds with the ethernet connections was extremely slow. I logged into the router and noticed that CPU usage on Core 1 and Core 2 was fluctuating wildly between 0% and 100%. Rebooting the router did not fix it. The only way that I could fix the problem was to pull the power plug, let it sit for a few seconds, and then restart it. I then got both wireless bands back and CPU usage was back to normal. I then started to configure the settings in the router GUI and the problem problem returned. I corrected it again by pulling the power then restarting it. Any ideas on what the issue might be, and what do you suggest that I do to fix it? Maybe a bad firmware flash and I need to re-flash the firmware??

 

[dsring]

Update...I flashed Merlin 382.2_beta2 back onto the router. I then went into the settings that affect the wireless radios (I toggled the WPS button on then off) and I was able to recreate the issue where I lost both wireless radios and CPU usage on Core 1 & 2 was fluctuating again.

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[dsring]

I was able to get the issue stopped by flashing the Merlin 382.1_2 firmware.

 

[dsring]

OK....the 100% CPU issue returned. I believe that I have figured out what was causing it. Any router setting change that causes the 2.4GHz wireless radio to restart results in the problem. I can get it to stop by powering cycling the router. It is consistent across all 382 and 384 series firmware versions. Any ideas of what the issue might be?

 

[maxbraketorque]

Did you do a full reset?

 

[dsring]

Yes, a reset was done. Looking at this thread, it looks like several folks with the RT-AC3100 / 88U are having a similar issue with the newer firmwares...http://www.snbforums.com/threads/100-cpu-usage-on-core-1-of-ac88u.41972/

 

[curlysir]

Don't know the cause but the high CPU usage problem has not returned on my RT-AC3100 after I did the power off/power on cycle twice (once for each core) on the router about 3 weeks ago.