Xp Laptop dropping connectivity to SBS2008 server

I have one computer working correctly again, but a second computer has the same symptoms.... so I am investigating deeper - anyone have any ideas as to why this happens...

The computers seem to lose connection to the server.  I thought it was actually dropping from the server, but Outlook and exchange seem to be functioning fine.  The user just loses access to the share.
The first computer I tried removing the computer from network, renaming machine, and reconnecting to the network, but after a short while it started again.  When I realized it wasn't hardware and it wasn't actually losing connection I tried remapping - it wouldnt find the server by the short name (SBS123) but it would if I used the long name (SBS123.company.local).

Why is it happening and can I prevent it?
BBolt73Asked:
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Kruger_monkeyCommented:
Have you checked the event logs on the machine to see if anything is being logged?  Also try appending your DNS suffix to your ip configuration, then your short name should work.  Doubt it's the cause of the problem, but it might be a dns issue of some sort.
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uescompCommented:
I agree with Kruger Monkey, try using a static to test if this happens again, also are you connecting through wireless or hardwired, could be something with the lease times on your wireless router (if applicable).  But I would try a static and see if you drop out anymore.  Also on the pc having issues try opening command prompt and ping the server:

Example:  Ping SBS123 -t

this way it will constantly ping the server and then you can see if your dropping a connection.
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BBolt73Author Commented:
Computer is hardwired - IP is static.  Still seems to lose trust with server.  Even if it says computer is offline I can go through long name and get to where I want.  I just can't figure out why.
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uescompCommented:
you would perhaps have a proxy setup?
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BBolt73Author Commented:
No, not a proxy setup.
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uescompCommented:
did you test the cable back to the patch pannel, or try plugging into a different port?
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uescompCommented:
You can also check to see if there are any managed passwords and remove those.  Open up the run command and type in:  control userpasswords2  and click on the advanced tab.

Also how often is the system losing the share, meaning there is a time for when Group policy refreshes so maybe the system is clashing with it.

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BBolt73Author Commented:
cables are good... i will have to look at the managed passwords... I will let you know - out of office next few days.  Thank you for your help so far... we will figure it out.
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BBolt73Author Commented:
Had to perform a work around and send it to the long name... just too busy.  If it happens again I will bring it up again... Thanks for trying, I appreciate your help.
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