I have a problem with my samsung galaxy s6 edge.

Hello guys, i have a problem with my youtube so when i play video i watch like first 30 seconds of video and wifi is gone, and i must go reconnect router and its not helping i watch again 30 seconds and again the same.. and its only on my samsung on ipad/pc everything is ok.. so what is the problem and how to fix it?

P.S its only with youtube and sometimes with snapchat but facebook , google play and other apps is ok.

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