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From: jb <jb.1234abcd@gmail.com>
Subject: Re: dhclient and random disconnects
Date: Thu, 13 Dec 2012 21:10:25 +0000 (UTC)
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David Demelier <demelier.david <at> gmail.com> writes:

> ...

Logs are your friends.

If the lease actually expires and you have to get a new IP (a new lease), then
you could have a temporary disconnect.
But if dhcp server(s) are working correctly the lease should be renewed or
rebound without problems.

Search  for "dhc" and check how much time (see time stamps) it takes to renew, 
or rebind your IP address, or if it has any trouble with both of them and it is
forced to obtain a new lease:

$ less -i /var/log/messages

Look for any other errors in there too - e.g. WPA2 encryption protocol related,
like failing of security key exchange.

If you find any, post a sufficient copy to the list here.
jb