Network issues after returning from sleep mode

I'm noticing this issue on T440, Twists, T420s, whether it's Windows 8, Windows 8.1 or Windows 7.  Sometime around the end of last year and the beginning of this year, my users suddenly started reporting problems with the machines after returning from sleep mode.  The network adapter (whether plugged in or using wifi), would show limited connectivity and would not connect to the internet until the machine is rebooted.
I've tried updating drivers, using system restores, disabling the network adapters from shutting down to conserve power, OS network diagnosis & network adapter resets, none of which has worked.  Hibernation is disabled on all machines.
The only fix I have is to reinstall the OS over the top of the system and reinstall all updates.  Looking for help with this issue.
Thanks!
Solved!
Go to Solution.

Hi Mertz74,
Thank you for replying us back!
Please check with uninstalling power manger and reinstall it with latest driver.
Download chipset driver from Lenovo drivers page and install it.
Please check with above option to resolve the issue.
Below is the link to enter the downloads page and download updates accordingly, please click on "Select Product" then in "QUICK PATH" enter the MTM no. select the exact model.
http://support.lenovo.com/en_US/downloads/default.page#
Hope this helps. Do post back if issue persists!
Best regards.
Hemanth Kumar
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