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I have a galaxy s5 phone running on android 5.0. In home and in office, when I'm connected to wifi network and the screen is locked (sleep), whatsaap doesn't receive any message until I unlock the screen. I don't use so many apps so I can't confirm if this is the case with other applications or not, however, I might have experienced the same problem with email app as well.

Keep Wi-Fi on during sleep is set to Always, I don't have any power management application or any particular settings. I checked Whatsapp faq and they suggested checking priority notification, which I don't use. Searching the web suggests clearing cache and data which doesn't solve the problem.

Any workaround?


Edit:

I have observed my phone behavior and noted that other applications (e.g., hangouts) show act the same. Furthermore, I noted another fact that might shed some light: Say I unlock my screen and after several seconds my apps start to notify me about some messages. But time-stamp of these messages aren't for this moment but rather [e.g.] half an hour ago when they were suppose to be delivered.

Edit2:

I have cleared the cache/datafiles, updated the app etc. I would highly applicate if you submit answers that do not suggest these generic (and almost always non functional) workarounds. Thanks.

  • does it work when you are using cellular data instead of wi-fi? – helleye Oct 28 '15 at 15:31
  • @helleye, I can't be sure but I think it's a yes. – Pouya Oct 28 '15 at 15:34
  • Have a look at this..The post also covers a lot of Samsung devices plagued by this Android Forums at AndroidCentral.com forums.androidcentral.com/samsung-galaxy-s6/… – beeshyams Nov 10 '15 at 14:53
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I think your issue is related to the OS ,as discussed in this forum Link ,maybe a new update from Samsung might fix this issue.You should contact Samsung service ,some guy exchanged his Samsung S6 over this issue as mentioned in the discussion

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Just uninstall whatsapp and re-install again but before doing so you should backup all your files/conversation and it should work fine. Also its better to power-off the phone when you feel that you really don't need it specially during your night sleeping hours or keep on Airplane Mode, it works. Hope this will solve the problem, good luck.

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