@Kevin_Z I tried channel 108. So far I didn't get the problem with the channel auto move to 42/44. But before that (yesterday) I tried 56, 64. It returned back to 42/44 immediately after the signal...

@Kevin_Z Thank you, I will try to make it on and use 64 after I go back. Anyway for this model, I cannot use U-NII-3, right ?

@Kevin_Z Thank you for your reply. I did make sure that the DFS was off. I was checking what channel was vacant manually. The most used is 44, so I moved to 64, and 1xx something. The channel is...

I changed the 5GHz wireless channel multiple times, everytimes it turned back to 44 and collapse with neighbors' wireless network, and get the very bad ping to access point. Any suggestion ? Thank...