Thinkpad T440s Ethernet Adapter Automatically Disabled

I have a Thinkpad T440s 20AQ with a Intel I218-LM ethernet adapter. The OS is Windows 8.1 x64
Since approx. half year ago, the ethernet adapter started to disable itself automatically every 1-4 weeks. The occurance of this problem has no pattern and is unexpectable.
When it happens, I cannot reenable it under Network Connection window. Rebooting the system has ~50% chance to solve this problem. The reliable way to solve this problem is disable and reenable the adapter under Device Manager. 

Which driver version?
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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