EufyCam E no longer senses motion

My EufyCam E, which has worked perfectly since I bought it several years ago, has stopped sensing motion.

It will, however, record when one of my other cameras starts recording, through the rules I have set up.

I have checked all of my settings – sensitivity, etc. – and everything is set up how it is supposed to be.

Anybody know what might be the problem?

Don’t know what the problem may be. Could just be motion sensor circuitry end of life.
Have you tried just turning the camera OFF then back ON via the app? Also try toggling the motion detection OFF & ON too.