Why does my wifi connection stop working sometimes?

Hello.
Maybe this has already been answered and I'm sorry but I didnt know what word to use in english to find the exact problem in google lol.
Well, The problem is that my wifi connection seems to stop working sometimes, it takes about 1 to 10 min and then it just comes back. I can notice it because Safari stop to load pages, the appstore doesnt load, and I tried with google chrome : same results
I experience this about 2 to 5 times a day, it's just pretty annoying. The wifi logo shows that it is always connected, it never shows that he is reconnecting
May this be a router problem...? Or simply the computer
My specs : 1,6GHz, intel core i5
2go of RAM. It's a 2 years old MBA
Thanls a lot !

Hi CPUGenuis!
I have an article for you that addresses this situation and will help you troubleshoot this issue:
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Symptom: The network connection drops unexpectedly
Your Mac may not not stay connected to your Wi-Fi network reliably.
Your Mac may stop accessing the Internet during use.
Solution
Use these steps if your computer disconnects from its Wi-Fi network unexpectedly.
Check your range to the Wi-Fi router and reduce the effect of interference.
If your computer is too far from your Wi-Fi router or your environment has too much Wi-Fi interference, then your computer may not detect the Wi-Fi network properly. The easiest way to check for range limits with your Wi-Fi network is to move your computer or your Wi-Fi router closer together and make sure that there are no obstructions (such as walls, cabinets, and so forth) between the router and your computer.
See Potential sources of wireless interference for more information about interference and solutions.
Try connecting to a different Wi-Fi network. If your computer works fine when connected to a different Wi-Fi network, then the issue may be related to your network router or ISP. In that case, contact the manufacturer of your router or your ISP.
Thanks for coming to the Apple Support Communities!
Regards,
Braden

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