Wi-Fi not working properly

Wi-Fi not working properly

Wi-Fi not working properly
Wi-Fi not working properly
Yesterday
Model: Archer MR550  
Hardware Version: V1
Firmware Version: 1.10.0 0.9.1

My router works fine with a wired Ethernet connection, but the Wi-Fi is very unstable and often does not work. Sometimes it is very slow, sometimes it disconnects, and sometimes devices cannot connect at all. I already tried restarting the router and changing the Wi-Fi channel, but the problem continues.

Could you please help me fix this issue?

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