Welcome to the forum and excuse me replying to you in English. If you need a translation then please just ask or use something like Google translator.
It would be helpful if you could elaborate on the problem a bit more but it sounds like you are continually getting this word recognised when not actually saying anything? This is normally due to one of the following:
1. Make sure the microphone is positioned at the corner of your mouth about 2 cm-3 cm from the corner of your lips. Not directly in front of your mouth.
2. Try running "Check Microphone" again from the "Audio" menu. When you do the sound volume and sound quality tests speak slightly lighter than normal.
3. If none of the above helps then create a new user profile.
Zusätzlich würde ich noch das Wort "nun" einzeln trainieren.
Ich hatte die Probleme mit sinnlos eigefügten Kurzwörtern früher auch gelegentlich, die ließen sich aber immer durch Lindsays Empfehlungen 1 und 2 bzw. das Training der falsch eingefügten Worte beheben.