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I have three Android devices.

Lenovo A7000 with Stock ROM Lollipop 5.0 HTC Desire 620G with Stock ROM KitKat Samsung galaxy Tab 2 with custom ROM (Resurrection ROM) Lollipop 5.0.2.

In all these devices the WhatsApp sleeps frequently, when the screen is Off. I mean when I on the device screen and use WhatsApp I am getting messages normally. But when the screen is off after a short span of time, it stops receiving messages. I need to turn on the screen and open WhatsApp to start getting the messages. Then bunch of messages will be received.

I am facing this problem in all the three devices in both Wi-Fi and Mobile networks. My Wi-Fi network is fast enough (40 Mbps) to receive the messages at instant and mobile networks are decently fast (>3 Mbps).

In WhatsApp Web I am getting Phone Not Connected yellow messages when I turn the screen off. After researching in the Internet I learnt this may happen when the device enters power saving mode or when Background data is restricted. But in my devices I never turn on power saving mode and never restrict background data too.

Any other reasons? For this reason I have changed screen timeout to 30 minutes and left the WhatsApp open. Is this an app bug or some other problem?

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It's common. I've tried all sorts and still don't receive messages until I manually turn the screen on. Only thing I can think of is using wake lock power manager https://play.google.com/store/apps/details?id=eu.thedarken.wl May use a little battery but will fix your problem

  • Have installed it. Will comment back after checking with it :) – Viswalinga Surya S Apr 10 '16 at 7:29
  • The app does not resolve the problem mentioned above. – Viswalinga Surya S Apr 10 '16 at 18:43

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