Sequencer freeze when editing curve

Hi,

I’m having an issue with the sequencer in UE4.16. I’m animating a Material Parameter Collection and every time I want to edit the curve for a Brightness scalar parameter the engine freezes and I have to kill the app in the task manager. But I was able to edit the curve for hours before.

I tried to create a clean version of the sequence by starting fresh and it worked for a bit but now keeps freezing too. It happens even if I try to edit when another map is opened. I have several hundreds break point for the animation of a material - that’s a lot but it worked on the cleaned version so this might not be it.

Any other idea on what’s the issue and how to fix it?

Thanks a lot