Cameras Not Capturing Motion

I have eight first gen spotlight cameras. They are battery/solar operated. I believe they are about five years old. With time, they are no longer recording the start of motion and at times no motion at all. As an example I received a delivery at my front door, the entire delivery process was ignored. Recording didn’t start until I went out to get the package. Another incident was a car accident in front of my house. The first recording was when the police officer was getting out of his car. That was a full 20 minutes of motion that was ignored. It is not just one camera, it is happening on three that I know of with similar actions. Does anyone know some way correct his? Thanks for any help you may be able to offer.