Why does my iPhone 3G keep disconnecting from Wi-Fi?

It's not in service so I have it connected to my internet from home.
Just recently the internet keeps disconnecting and connecting everytime
I open up an app.
I have already rebooted my iPhone & restarted the network settings but it still keeps doing it.
Could anyone help me with this problem? I'd appreciate it thanks!

I have a few suggestions the first thing is you should try turn off other devices that use your Internet such as a Amazon Kindle, a laptop that's on doing nothing or another phone. Other thing you could do is reboot your wireless router that might work, the last thing I can think of is your router is a bit too far from your iPhone I have that problem sometimes so the thing to do is for you to is sit closer to your router. If it persists contact your Internet provider hope I helped

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