All my Entitys not available like switches and sensors

Hi,
I need helps for issue with Entity availability. Everything works fine while one day I got error massages for all my entity’s .
Screenshot_1

All my Entitys are declarative in /config/configuration.yaml file.
Screenshot_2

Home Assistant version is 0.97.2. How I can fix this issues?

Can you please show your log?

I think it could be a problem with the MQTT server.

For the next time please post your code directly in the forum and don’t upload a screenshot of the code.