Wifi problems

[Microsoft Windows]

I took my laptop to be repaired thinking it was an internal problem I took it to 6 different people and they couldn't find anything and for a while I've been trying to connect to wifi I connect for about 5 minutes and then it disconnects it shows me that I can't connect to wifi and when I refresh no wifi network appears. I've tried absolutely every command in cmd and it doesn't work I tried to see if it's because of the wifi I changed it and it still doesn't work and I don't understand why

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