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Samsung Galaxy J4 sleeps during a WhatsApp call unless you touch the home button

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No matter how hard I try my Samsung J4 won't wake up during a Whatsapp call. I've tried every option available. Power saving mode is off. Can the phone lose connection to WiFi if it stays idle for too long? The mobile is without a sim card, I use it on WiFi only.

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Can You reset tha whole system the only way i can Fix it
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