Canvas Scaler causes crashes in the app

I have a scene with multipule canvases. All has Canvas Scaler. The app was running fine, but suddenly it start crashing sometimes when I am loading the scene. I saw that the crashes came from the Canvas Scaler of one of the canvases. I removed it and now it's working, but I need the Canvas Scaler. Does anyone knows what can be the issue? I didn't find any answer on the web