Q: Wireless Losing Connection

Hello, after a few minutes idle, my computer loses its connection with no apparent reason. I am using wi-fi connection.

I have another mac book that does not do that.

I tried repair disk permissions, reset network data, nothing seems to fix it. It is not a problem of my router because the problem happens at my home or at my workplace.

I have Yosemite (10.10.1) with a macbook pro retina (late 2013).