Mapped Network Drive Problem

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I have a problem with mapped network drives on windows XP.
The drives are on different linux samba servers on different networks. One server is in my home, on my local network. The other one is where I work, on the local network there. The problem is, when I access a drive at home, then hibernate the computer and go to work and open up my computer or any other program that needs to read the drive structure, windows hangs for about 30-60 secs, every time I try something.
But if I start windows up normally (non hibernate) then it's allright, the drives on the local network are online, the others are inaccessible.
I want to be able to make a network drive inactive, without rebooting or removing it.