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Laptop wireless - flaky at home, OK at office

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I have a laptop running CrunchBang Waldorf:

cjg@cjglap-crunchbang:~$ uname -a
Linux cjglap-crunchbang 3.2.0-4/amd64 #1 SMP Debian 3.2.46-1 x86_64 GNU/Linux

I've configured its wireless interface both at home and at the office.
I take the machine back and forth without re-booting - at home I close
the lid and the machine goes into hibernation, I go to the office, open
the lid, and it wakes up, finds the wireless access point, gets a new IP
address (192.168.1.xxx), finds the office router, and happily accesses
the Internet.  The reverse - going from office to home - doesn't work
so well.  The laptop wakes up, gets an IP address (192.168.0.xxx), and
seems to know that the router is at 192.168.0.1 - but it only works for
a while, if at all.  Taking wlan0 down and bringing it back up makes
it work for a while, then it stops.  If I plug in an Ethernet cable,
everything is happy.  More or less - pings to the Internet take 5
seconds each, and pings to machines on my LAN (including my WAP/router)
come back "Destination Host Unreachable", even if I specify an IP
address instead of a hostname.

The route command takes 10 seconds to come back with:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref   Use Iface
default         192.168.0.1     0.0.0.0         UG    0      0       0 eth0
192.168.0.0     *               255.255.255.0   U     0      0       0 wlan0
192.168.0.0     *               255.25.255.0    U     0      0       0 eth0

If I unplug the Ethernet cable, the route command returns "wlan0" under
the Iface column on the default line, and loses the last eth0 line.

The copy of Windows XP I have running under VirtualBox on my laptop
doesn't have any trouble accessing machines on my LAN - or the
Internet - as long as the Ethernet cable is connected.  My wife's
laptop, which runs Windows 7, can access my LAN wirelessly.

The wireless network at the office broadcasts its ESSID, while my
home network doesn't.  Could this make a difference?

There must be some sort of configuration problem in my laptop.
Any suggestions as to where to look?  Is there a good guide to
setting up wlreless networking, expecially for laptops that move
from one network to another?

Thanks for any pointers anyone can provide...

-- 
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Thread

Laptop wireless - flaky at home, OK at office "Charlie Gibbs" <cgibbs@kltpzyxm.invalid> - 2014-03-02 18:48 -0800
  Re: Laptop wireless - flaky at home, OK at office Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2014-03-03 03:53 +0000
    Re: Laptop wireless - flaky at home, OK at office "Charlie Gibbs" <cgibbs@kltpzyxm.invalid> - 2014-03-03 11:36 -0800
      Re: Laptop wireless - flaky at home, OK at office Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2014-03-04 19:45 +0000
        Re: Laptop wireless - flaky at home, OK at office "Charlie Gibbs" <cgibbs@kltpzyxm.invalid> - 2014-03-04 18:23 -0800

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