Constant misfiring nerves!

A few months, the keyboard worked well. But since a couple of weeks, there are regular "dropouts": They want to enter something, but it does nothing. By repeatedly Turn on and off it eventually becomes an extent that it. For a few minutes or sometimes hours working again From then there are the same "Ges *****": You want a text or similar enter, but it is not. If you're there to do an important job and has no replacement keyboard at hand, then enjoy at work.
I'll return the keyboard and order me a hope not only in the short term functioning other.
PS: Just in writing this text, there was the next dropouts. Annoying, that thing!