Bosch Pro D-tect 200 C not able to detect live wires...

Huge disapointment with this D-tect 200 C. I am a big fan of Bosch Pro and own a bunch of their tools.
I was hoping the best with that detector but not being able to detect 12 live wires in a dry wall is not acceptable, even dangerous! Any $30 detector will beep like crazy to make you aware of the danger...