Contact Sensor (Gen 2) stuck on open

Hi, my contact sensor is stuck on open. It all started with the sensor triggering my alarm while it was armed. I thought my home was being broken into, police were also dispatched. Upon inspection nothing was physically wrong with the window or the sensor and my window was closed. I looked online to see if I could find any solution and followed multiple steps to remove the device, factory reset, and add it back to my base but it continues to say the window is “open”. I even tried replacing the batteries to no avail. Yesterday the sensor kept toggling between open and closed and freaked me out when I heard my base chirping like crazy. For some background info, this particular sensor is located toward the back of my home but I have a range extender. There are also multiple sensors located in the same area that have not given me this problem. The sensor is a little over a year old now. Any help or suggests is much appreciated.