A false alarm after the other

Due to an error of home management of these smoke detectors has been with me a little more than a month installed in one room (this was already the other smoke detectors in the room available). Anyway, in the first few weeks and everything went as far as problems.
But about a week ago was suddenly without warning for the first time the alarm off without me apparent reason. Neither cooking fumes or dust, not to mention of any smoke, were in the air. So I pressed the alarm stop, and the smoke detector was then also still again, even after the 10 minute alarm-stop waiting.
A few days later, again a false alarm. Again, I had not done anything at this time, what kind of a false alarm might have led. Again the smoke detector was simply at rest.
But yesterday the barrel has overflowed. Again, there was a false alarm and of course I have again pressed the alarm stop button. But in each case after 10 minutes the alarm went off again and again until I have the smoke detector at some point simply dismounted and off. I then eventually been turned on him again, but the alarm now started right away again.
Thus, it had done for me, the smoke detector is now removed permanently. Mind you, I'm in the same room is another functioning smoke alarm that has not sounded the alarm. The smoke detector did not seemed to me in some form dust, or that he had, for example, captured an insect. I could not understand the cause.
If the smoke alarm would have been defective from the start, no problem, but the error has occurred with no apparent external effect only after a few weeks. Therefore, I have strong doubts about the maturity of this unit.
So I can not recommend it.

Supplement 18:01:13: I live in a house with many mansions and this smoke alarm was also installed in others. Meanwhile, I'm no longer the only one false Plag (ed). My direct Wohungs neighbors include already affected and for them it was from much the same as with me. This device seems to be prone to errors beyond measure. Incidentally, the volume of the device is such that the warning sound is perceived only comparatively unobtrusively in the next room (ie from sleep it would not wake me up when the device is not directly in the same room hangs). By one or two partitions continue the sound would think I have only heard in absolute silence and increased attention.