Macbook Loses Connection

MacBook Pro loses the wireless connection?
I have a MacBook Pro and a PC laptop connected to a WiFi network. The MacBook Pro cuts the connection periodically as the AirPort icon shows no connection. When I click the icon that shows a list of 2-3 wireless signals, one of which is my network, but is not checked. Selecting the network again reconnect the computer. Previously I had an iMac, which never lost the connection. The PC does not have this problem. It does not change if the PC is on or off. I tried changing AirPort settings in "default combination:> Automatic" to "> Preferred Networks "But that did not solve the problem. The loss of connection does not match screen savers, laziness, or log off. It can occur while that the active use of a browser. Software is updated. The distance to the wireless access point is approximately 30-35 meters.
One of my clients has a 17 "MacBok too with the same problem, installed a high-powered antenna with an interval of a mile (the house is great), they can get wireless at the 5th plant, but on the Mac, which is the same floor but the room two away, the connection is cut fully randomly without notice, we tried everything to find the cause, but no luck, have a PC that also the same distance but next room, which never falls. I think that your Mac hardware, but can prove
Lacie Losing Communication With MacBook Pro
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