13" MBP internet connection gets disconnected when too many wifi connection's available

I just notice this a couple of nights ago... Im using a 13" MBP I bought last June 9.  At night, when there are plenty of wifi connections being broadcast in our condominium bldg, my internet connection is very slow.  Also, the signal strength is reduced to half.  Sometimes I even get disconnected and the MBP wifi has difficulty reconnecting my wifi.  But when morning comes, signal strength is at full.  I ask my friend who also connects to the same wifi if ever he has difficulty connecting at night, but unfortunately its just me.  He is using windows, by the way.  I'm wondering if this is a known issue and have a fix already? or it's just me?
Please help... Thanks.

I use my 15" MBP this way with no problems at all and I have Mountain Lion installed.  So we need to look elsewhere for the problem, it's not possible to link this to the OS without further investigation (but it could be a system setting).
I  know that other folks are complaining that Mountain Lion broke WIFI.  But if that were the case we would all have problems.  I, along with many others, have no problems at all.  I think there is something else going on.
What is the signal strength with the lid open vs. closed?
When you say that Safari does not work, are you getting a timeout message or a message like "You are not connected to the Internet."?  Of course this is the English version of the message, yours will be different.

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