T400 - Thinkvantage Access Connections not connecting after sleep/hibernate

I have a relatively new T400 for work - and there are no problems connecting wirelessly at work.  However, I have set up my home wireless network, and I have problems.
When I power up my laptop, I can create a Connection Profile for my home network - and it connects no problem.  However, if I let the laptop go to sleep, it will not reconnect upon waking up.  Using the diagnostics, I get 3 errors - (a) make sure your encryption settings are correct for this network (it connected before, so they are)
(b) contact network adminstrator (that's me)
(c) your profile is on the same channel as an active network (yup - mine)
The only solution appears to be to delete the profile, reboot the PC, and recreate the profile.
Windows XP Pro, Thinkvantage Access COnnections 5, Intel 5100 wireless card (and T400 as I indicated earlier).
Any tips?
Thx,
jason

All of hte MS updates are applied.  I have tried the Thinkvantage System Update utility, but it does not work (System Update 3).  When I start it, I get the splash screen for the program, and after a few minutes the splash screen disappears; when I check teh taks manager, the system update tool is not listed in the Applications tab.

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