Iphone 4 wifi connectivity

Hello everyone
I have this issue with my Iphone 4. I am using a Netgear DGN 2000 wifi router and I connect 2 samsung, 1 LG TV, and this iphone with it. Each time I leave my iphone after connection for few minutes and when I start using it again the wifi connectivity is gone. And the wifi device starts showing in a separate list - "devices" on iphone and when I try to connect with this wifi again it does not connect and I have to switch the wifi off and on again and it connects alright.
THis is problem does not happen with samsung devices all the time.
COuld anyone suggest to do some settings so that I don't have to do this on and off business.
thanks

I have this issue with my Iphone 4
And we answer questions about the Apple routers in this support forum, the AirPort Express, AirPort Extreme and Time Capsule....products shown below:
Since we are not iPhone experts, about all that we can do is suggest that you work your way through Apple's troubleshooting guide for iOS connections, which is linked just below:
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support
Otherwise, you might want to post your question in the forum where the iPhone experts hang out.......the iPhone Support Forum linked just below:
Using iPhone

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