Slackware :: Vbox Brakes 1 Of 2 Network Interfaces?

I am trying to setup a virtual machine on virtualbox on slack64 13.1. It's purpose is to be gateway pc, so the vm's are only gonna be here until a VM server will be setup - but that could easily complete after 2 months. The test-phase setup is that this gw () is part of the internal network and I have only attached 1-2 clients that it serves (ie these clients belong to a 2nd level internal network). I do most of the setup by ssh'ing from the INET if (my pc is also part of the internal network and not of the 2nd level one).

As fas as my vm in vbox is concerned, I have setup a bridged connection to eth0 (the LOCAL if), since I'm gonna be running a printer server out of that vm (so NAT'ing would perplex the setup) The problem is that all of a sudden, when virtualbox is running the INET if gets broken, and I lose connection to the gw, from the INET side only! the LOCAL if is still working, the 2nd level clients are working fine. Locally, I can do

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I doesn't occur when I do something specific but it is a frequent crash nevertheless. I can push my luck too; from the INET side of the gw I had :-an ssh session open, -an X session open - so that I could have access to the gui of virtualbox application and my running vm. -an ssh tunnel on port 139 in order to bypass the gw's firewall and get access to some samba shares on the gw. I tried 3 times to copy a 2GB iso image from my pc to the gw and all 3 times the INET if broke. Finally, if i disable start up of the virtualbox and restart the machine, the problem doesn't occur.. (i'm 16h without virtualbox and the INET if hasn't broken - the same was true before I started setting up my vm).Has anyone experienced problems with virtualbox and the physical interfaces? Especially when using bridged virtual interfaces?