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QoS broken with firmware 380.58 on ASUS RT-AC66U

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I have been using QoS successfully with the past several versions of the firmware. After upgrading to 380.58, the router CPU core is maxing out at 100%. At first I didn't know that the router CPU was maxed out, because after submitting my username/password to the web interface, the router would not deliver up the web pages. So I had to reboot the router, and disconnect all other devices. Then I could load the interface. All seemed normal. When adding the other network devices to the router, then the CPU starts to climb over time until it maxes out again. I learned that if I disable QoS on this firmware version than I do not experience an issue.

Is it a known issue that QoS has issues with the firmware version 380.58 on ASUS RT-AC66U? I wonder how the QoS rules are prioritized and if they are stepping on each other's toes?

Asus QoS screen.PNG

Asus QoS rules.PNG
 
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