wifi not working after i close lid

Whenever I close the lid of my macbook and when I reopen it the internet connection is no longer working. It shows that the wifi is connected but i can not acces any site or get a ping response. To fix this i have to turn wifi off and turn it back on. Why is this happening?

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howapple - hello

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Well my problem got solved very simple... i connected to a diferent wifi network than the problem went away even on old network

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