My internet connection randomly drops until I disconnect and reconnect to the router?

My internet connection randomly drops until I disconnect my computer from the router then reconnect. It is only the internet connection that drops, the router signal/connection remains and my NAS can still be accessed. Sometimes it goes hours without loosing connection, sometimes it's minutes. I'm using a macbook pro with mountain lion installed, and the same issue occurs with my iphone.
My network set up is essentially the modem > switch > router > laptop/iphone.

This sounds a little different from my problem but I have a iPod touch. For some reason I would loose Wi-Fi when I locked my ipod for about 5 minutes. It only happened on my ipod, not on my ipad or my sisters ipod. I didn't know what the problem was but it was annoying. Even if I played on my ipod nonstop for about 10 minutes I would randomly lose Wi-Fi. I found a video on YouTube showing how to fix my problem and it worked. All you need to do is go to your settings, go to general, scroll all the way down and go to reset, then look for a thing that says reset network settings. Click that and it should restart you're iPhone. I don't know what you're computer will do but it worked for me so… I hoped this helped!

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