T440s Keyboard working intermittently

My T440s Keyboard working intermittently (randomly switching from a functioning keyboard to totally disable state)
OS: Windows 8.1 Pro, 64 bit
In the disable state
None of the keys work, with the exception of the FnLk
USB external keyboard works
Both pointing devices (pad & the RED Tip) works.
Touch keyboard works

UPDATE .. I have updated all drivers & BIO's and still the problem exists.
Is the only solution to send the unit in for warranty repair?
Is anyone experiencing the same problem?
Any suggestions?

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