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Several times over the past year the wi-fi failed then, after about 5 day, it started working again.

How to diagnose the problem?

  • resetting the phone's software restores the wi-fi connection
  • wi-fi icon says it is connected but it is unable to connect to the internet.
  • Connecting to the router IP address times out. All attempts to connect to the internet via wifi time out, as far as I can tell.
  • connecting to the wi-fi with other devices works fine
  • wi-fi routers are visible
  • Android version 4.2.2

Ideas?

  • for a start to diagnose the issue pull the logs and if more info is needed the kernel logs (dmesg) too. – Bo Lawson Dec 31 '15 at 3:41

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