Wifi Auto disconnect after 5-10 of sleep.

Here's my technical data:
Iphone 4s
iOS 8
I connect to wifi and lock my phone, after 5-10 minutes of sleeping the wifi auto disconnect.
To test this, I tried sending a LINE message and as expected, I didn't receive the message.
Is this a problem with the OS or is it normal for wifi to disconnect automatically?

Reset the device:
Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.
If that doesn't help, tap Settings > General > Reset > Reset All Settings
If that doesn't help, tap Settings > General > Reset > Reset Network Settings
You may have to re enter your Wi-Fi password.
* No data is lost due to a reset

Similar Messages

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    ~~~~~~~~~~~~~~~
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    ~~~~~~~~~~~~~~~~~~~~~~~
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    iPad: Issues connecting to Wi-Fi networks  http://support.apple.com/kb/ts3304
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