Connecttion too unstable.

[Antonio Carlos Ribeiro Nogueira <nogueira13 gmail com>]

Hi, 
I am trying to use a wireless network and I get connection ready very
fast. But it disconnect in a few minutes. I am using Ubuntu 10.04
64bits. I have dual boot in my Laptop. If I boot by windows, I got the
same connection very stable. Even I connect through my Tablet Nokia 810
(Symbian S60), I got the same connection very stable too. I already
tried to reinstall all the packages related with NetworkManager, but it
doesn't work, the connection keeps unstable. What could you suggest to
me? Thanks in advance and I beg your perdon for my poor English because
my native language is the Brasilian Portuguese.