Camera randomly stops sending notifications

Eufy cam 2c in one location stops sending notifications randomly . I run the system in geofencing mode and the correct notification preferences are set for both home and away , exactly the same as the other three 2c cameras on the system, which all reliably send notifications to my android phone. I have tested the PIR sensor on the camera which works - it just won’t record or send a notification. I have tried deleting and re-adding the camera which resolved the problem for a short time, but then stops sending again. No issue with the other three cameras. I have only had this system for 3 weeks please help.