New iMac Wifi Problem!

Sometime the wi-fi connection freezes and internet doesn't work in the new iMac 21".
How do I fix this?
Thank you!

Thanks, but I have no problems with the wireless network. My MacbookPro, iPhone works perfectly with my wireless network and I live in my house without the neighbors. But the Internet to a new iMac freezes sometimes (especially after sleep) and I have to reboot the iMac. My iMac has been updated.

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