Yoga 2 Pro keyboard light

Hi,
I have a Yoga 2 Pro for just a few days.
I noticed that the keyboard light is not workiing properly.
Sometimes it lights up, sometimes it does not.
Sometimes I can turn it on and off (fn + left space), sometimes I cannot.
Once it came on by itself, but when I pressed a key - a letter key - it turned off and I could not light it up again.
I noticed that when it does not work, if I change mode (from laptop to tent or tablet and back to laptop) most of the times I am able to take it on.
I am guessing this is a hardware problem.
Am I right?
Is there anything I can do to make sure it is a h/w failure before getting it to a service center?
Thanks
Costa

Simultaneously?
I'll give it a try...thx

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