@cmr , First of all thank you very much for your quick answer. Our Realtek chipset model is RTL8822BE. While we were doing test with Cisco Meraki engineers they offer us to disable wifi 6 and they created another SSID just for test and we did same test that you offered. First it seems it is working normally. But several hours later user informed that she has still same problem. Secondly, We also disabled power safe mode on some test laptops from realtek device manager settings. But it isn't solve the problem. Thanks.
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