MBA: Key does not react always to key press
I'm using a MacBookAir from 2012 (I guess the model is mid 2012 or late 2012, model A1466) and I've a little bit trouble with a specific key: the " + "/" * " key** only works intermediate. This means that nothing happens if I press it. When I repat it or hold it down after a few seconds the key press is emitted and then it works fine but if I don't use it for some time (maybe 30 seconds or so) it starts with the same behaviour (long press needed and so on). I've this issue now for 3 - 4 days.
So my questions are:
- Is this problem known? (Possibly not ...)
- How can I test if this is a software problem (I guess not) or a hardware error arising form wear?
- How to fix it?
P.S.: I looked around the Internet quite a bit and most topics on this deal with sticky keys. But in my case there (should not) is no sticky material in the key or it is not sticky.
** I've a German keyboard; on [1] the same key is the " ( "/" ) "/" ] " (I guess this is the US keyboard layout). But the exact key might not be of special importance.
MacBook Air, OS X Mavericks (10.9.4)