Random noise during YouTube vids on iPhone 5S

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Random noise during YouTube vids on iPhone 5S
I was watching YouTube on my iPhone 5S and suddenly in the middle of it there was this boingy sound(it wasn't a notification). At first I thought it was a one-time thing, but then it happened again, and then again the next day. Any ideas?
Repaly
WiFi always turns off when the phone goes to sleep (unless it is connected to power). That's why many streaming apps have an option to keep the phone from going to sleep. The other solution is to trick the phone into thinking its plugged in using an external battery such as a Mophie Juice Pack.
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