Trouble inserting a G4 sensor

When I insert the sensor, pinch the skin and hear the two clicks when pushing, another two clicks when pulling out and start the sensor in my Animas Vibe pump, after a while I get an ??? icon and the pump stops the session. This is the second sensor I've tried with today already, having the same issue. The transmitter is visible and when checking with xDrip, I get just bad values.

Is there anything I can do or are the two sensors just broken?