This may help

If it's a vibration/break glass sensor on the window it's quite possible that it has faulted and needs to be replaced.
Can you post a photo of the sensor?
If it's the…

That's a movement sensor.
Won't alarm due to vibration.
Should only go into alarm when it senses movement.
Could be cable damage between the main control box and the sensor or the sensor…

Some sensors last 5 years, some last 25.
It's a bit of a lottery really.
No moving parts as such so nothing to wear out but if there's been a supply voltage…