The PerchPopper is a reliable device and you should expect many years of service from it.    However, like any any mechanical/electronic device, it needs to be set up correctly to work optimally.  The most common reason customers have issues with the PerchPopper failing to release the perch bar and open the nest box is because they have tightened the hinge bolts/nuts of the perch bar too tight and the springs which pull the perch bar down after the magnet releases the bar can not overcome the friction of the over-tightened perch bar.  The instructions that come with the PerchPopper describe how to tighten the perch bar hinge bolts/nuts to allow for proper operation.If your PerchPopper is failing to release the perch bar,  try doing this test to see if your perch bar is falling quickly enough-  hold the perch bar in the closed position with the catch plate close to the magnet, but without touching the magnet.  Let go of the perch bar.   It should fall quickly as demonstrated in the following video-https://youtu.be/WZc2DlW5kvEIf the bar does not fall away quickly and immediately after releasing it, loosen the hinge bolts/nuts until it does.One final note, you'll want to make sure you have good batteries as well.Contact Best Nest Box if you need any further assistance.