Node-Red (10.0.0) stopped loading

My node-red (10.0.0) was working but after making a change to flow it seemed to get stuck so I refreshed the screen and now when I try and open the Node-red screen it sticks at “loading nodes 1 of 105”. If I then refresh the screen again the node-red page stays blank. And then after a while, the dashboard brings up a message that it is disconnected, only to then connect again.

Nothing is showing up in the HASS logs under configuration (core-2021.9.7, supervisor-2021.09.0).

I know what flow I was working on, where can I find it on my disk so that I can try try manually delete it?

Not sure what happened. Restarting HASS did not help but stopping and starting the Node-Red pluggin seemed to fix things