Why there is a "Reconnecting" while I am using the ComfyUI?

A pop-up window saying "reconnecting" appears and then closes automatically, stopping the process.

Solution:

Normally this means your ComfyUI is restarting. As for the reason why it restarted, you need to take a closer look at the ComfyUI log file (on the top right of the RunComfy ComfyUI page there is a “Log” button).

1. OOM (Out of memory, either GPU VRAM or RAM). Switch to a larger machine or reduce the image/video resolution.
2. ComfyUI crash due to coding error. Check the log, find more information in the error call stack.
3. But sometimes it just mean the ComfyUI webpage lost the connection with the backend server and it will reconnect right away.