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When i wake up my phone(kitkat,cm11) from standby, it always transmits data through wifi and than stops transmitting/recieving data. It gives the feeling it always transmits/recieves while sleeping.

I turned down all location services in various places, i set wifi to turn on "only when connected to power" , turned of "scanning always availble" , but still no help.

What is the cause , and how do i track this down?

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    I'd start checking the logs. Some firewall app with logging functionality might also help. As it happens even with WiFi off (the app obviously re-enabling WiFi), you can narrow down candidates using a Permission Checker, concentrating on those with the CHANGE_WIFI_STATE permission.
    – Izzy
    Dec 15 '15 at 5:55
  • Glad to hear! Mind writing up an answer? Which app you chose, which steps you performed – and which culprit you identified? Could help others in similar situations. Thanks in advance!
    – Izzy
    Dec 15 '15 at 18:26
  • Oh sure. I used the firewall, afwall+ ,turned it on( and used whitelist - blocking everything ) , turned logging on. made phone sleep. Than turned it on - and on the firewall log - i've seen the sources of traffic - all pointing to google, which i can live with. Dec 15 '15 at 22:43
  • Slight misunderstanding: I've meant "answer" as in "pushing the 'answer your own question" button, giving the details there, then accept the answer :) Other than a comment, that marks your issue "solved", and thus easy to identify as "having a solution" :) See our help/self-answer page for details.
    – Izzy
    Dec 15 '15 at 22:47
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I've followed Izzi's advice and it worked. Here's what i did:

I used the firewall app, afwall+ ,turned it on( and used whitelist - blocking everything ) , turned logging on.

made phone sleep.

Than turned it on - and on the firewall log - i've seen the sources of traffic - all pointing to google, which i can live with - so i didn't continue further.

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