Why does my iPhone constantly disconnect itself from my Wi-Fi?

Okay, so I have an iPhone 5, and it's constantly automatically disconnecting itself from the Internet? I have tried everything to stop this. I've turned Wi-Fi on then off, aeroplane mode on then off, disconnected then reconnected, cleared cache and history of both safari and chrome, renewed the lease, turned my phone on and off, closed all recent program's, I've tried everything. It's not my Wi-Fi because I have it connected to my PC and it never disconnects itself, and its not the phone either because it happened in my previous phone (also an iPhone 5). Whenever the phone does disconnect itself, I just connect it again and it will cut out again after about 5-10 minutes! Why is it doing this!

Also, I have realises that it disconnects most often while I'm watching any kind of videos on my phone; such as YouTube, 4oD etc.

Any help would be greatly appreciated because this is really starting to bug me now.

You might have a bad connection to your Wi-Fi. It might be to far away. Other than that the box might be to old.

The logic answer is there's a bad wi-fi connection. I have perfect connection in the house however at work I need to constantly log in to wi-fi connection. Bad reception.

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