Wifi freeze the board

Hi. My system is Armbian VERSION = 20.02.1. I have detected that when I use the wifi connection, the computer freezes after a while, and to start sometimes you have to turn it on and off several times to get to the desktop, and even then it freezes after a few minutes. Luckily I do not depend on the wifi connection, because I have the ethernet cable at hand. And with ethernet there is no more freezing. What could be the cause of this problem?

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