my ipod 5th generation loses internet when sleep, my ipod 5th generation loses internet when sleep

every time i lock my ipod or it goes to sleep, the wifi connections is lost after a couple os minutes, so I don't receive any notifications such as imessage, facebook, facetime, etc. I've already tried forgeting the network and connecting it again, I've already tried reseting the ipod, though none of that seemed to work

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