Hello @FREDZIUAL 

Thank you for your post here and I wish I could help!

If camera stopped working, check the Led status on camera, is it Red or Flashing Green？

Please connect phone to Home Wi-Fi network and see if you could access the Camera on Kasa APP?

- If not, camera might disconnect from home Wi-Fi network, try to factory reset camera and set it up from scratch

How to reset the TP-Link Kasa camera?

- If you could access camera under home Wi-Fi network, but not remotely by LTE mobile data or non-local wifi network, try some suggestions in guide here 

• Reboot camera 
• Change router's DNS to 8.8.8.8/ 8.8.4.4
• Check router firewall log/ settings, and see if any tplink doamin or related request has been blocked by router. 
• Make sure camera is connected to router directly, not through other AP or Range extenders
• Make sure tapo firmware in kasa app and kasa APP version are both up to date 

Hope this could help~