Wyze sensors went offline

My wyze sensors all went offline except for one and check batteries read normal and WiFi good why?

This has been discussed here many times. The only solution is to follow the reset procedures. A quick Google will help find the link:

https://wyzelabs.zendesk.com/hc/en-us/articles/360034123991-Sensor-is-showing-as-offline#:~:text=Do%20this%20by%20taping%20the,plugging%20the%20Bridge%20back%20in.