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win7 x64 Lenovo laptops dropping LAN connection

I've had random Lenovo win 7 x64 laptops drop their LAN connection on our corp network (DHCP) the IP is lost and an ipconfi / renew does not fix the issues - only a reboot picks up a new IP and that last for about 20 min before it drops off again. First I thought symantec SEP 11.06 was the culprit; however, we have uninstalled it and still same behavior.

The only commonality is Lenovo laptops, win7 x64... all other machines are fine... any idea?
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DEFclub
Asked:
DEFclub
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1 Solution
 
vvladaCommented:
The problem could be Lenovo ThinkAdvantage Connection Manager - did you try to update this app with Lenovo System Update? Or you can try to deinstall it and test to see if this will solve the problem.
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DEFclubAuthor Commented:
Have you seen the ThinkAdvantage Connection Manager cause problems like this?
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vvladaCommented:
Hi,

Yes, but it was always with some other software also. Usualy update helps, so please try Lenovo System Update first (you can just update Connection Manager).

Best regards,
Vladimir
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DEFclubAuthor Commented:
Its not the Connection Manager. I also, have an HP desktop Win x64 system doing it now too. So win7 x64 systems is the only thing these systems have in common.

symtoms:
Loss of IP, network stack hoses. cant restart services - have to reboot. Then happens again and again..
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DEFclubAuthor Commented:
looks like it was the vpn software
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