Ok geniuses, I have a problem that I am fairly certain is user error somehow. I have an iPhone 4S. I have a linksys router. My wifi runs fine with every device in the house. However, ONLY on my iPhone, it ALWAYS makes me put my password in.

Question

We have another iPhone 4 in the house and it reconnects to the wifi just fine.  The kindle, the laptop, the Xbox all reconnect fine.  However, for some reason, my iPhone 4S makes me type in the wifi password multiple times a day.   It will connect and works fine while connected.   However, if I let it go to sleep, when I unlock the screen my wifi is "not connected".   I have to deselect the router and retype the password.   If something is using wifi like I heart radio or pandora or an update is downloading, it won't switch off the wifi, but in any other circumstance if the screen locks up and goes to sleep, when I unlock it I will need to reselect my network and retype the password.  I have been dealing with this for months and have googled several times for a solution with no success.  I'm pretty sure that when I was first setting up the wifi, I changed some setting on either the phone or the
router, but of course I can't figure out what I might have done.  Please help!

Answer 1

I read the article thanks.   I tried the settings-general-reset-reset network settings-reboot system-go to wifi settings-select wireless connection-select the ">"-symbol-select auto for http proxy.   I was optimistic about that because I thought I changed some setting somehow to cause this problem, but it didn't work.  More specifically, I did connect successfully and browsed the Internet for a good while, but then I put down the phone for a minute, the phone went into sleep/power save mode, and when I picked it back up a moment later it was no longer connected.  Dang.   Had to select the connection and use my password yet again. 
Another valuable bit of info for you.   The only network with which I have this problem is my home.   I use all kinds of devices at home and no other devices have this problem.  Also, I use this iPhone all over with various wifi networks at hotels and starbucks and family's homes with no issues whatsoever.  It remembers and automatically reconnects with every wireless network except the one in my own house.