Hi @thomasthomsen, thanks for your response. The building has several floors. The interference is very low above and below the floor with the interference. So I assume that the interference is on the floor of the AP. I will try turning off all power to the floor via the fuses and hopefully the signal will disappear. There is no other AP right next to this AP 😉 As a workaround, we already switched the clients to 5Ghz. Here are the RF-Spectrum from the floors 13-S (above) und 11-S (below).
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