First try the below
here might be several reasons why this is the case, please try to following steps to fix the issue:
Check if the magnet is still attached to the frame or the door/window.
When closing the door/window ensure that the magnet finishes next to the sensor and the app displays that the door is closed (A green light should indicate the door being closed).
Check if the sensor still has battery and is working as expected.
If no options above resolve the issue
Please raise a new case online and reference the title of this article.
