Installed a grade 3 surface CQR door contact on a clients Aluminium sliding front shop door.
contact works fine open/close everything is fine.
however it randomly causes a tamper alarm and then goes back to normal. Not always at the same time. Some days no tamper. What seems to be causing the issue. Never had this. Changed the sensor to a new one. Checked all the wiring and gaps ect. Still the same issue