@newjamie

Can you share the automation rules you have created? How many automation rules have you set up and what are the specific contents?

Please be more specific about the temperature changes you mentioned. Are the temperatures consistently increasing or decreasing? Or do they fluctuate between rising and falling intermittently?

Network instability may cause delays in T310's ability to retrieve temperature or humidity changes, resulting in ineffective smart actions. If you have experienced network disconnections, try to reboot the Tapo hub to reconnect the sensor. Or reboot the router to ensure the Tapo hub connects to the Internet successfully. 

For more information regarding the issues related to Tapo temperature and humidity sensor （T310/T315） automation not functioning properly, you can refer to this Solution. 

Smart Action: T310/T315 Temperature or Humidity Automation Doesn't Take Effect