Repeating lines in waterfall animation

Hi guys, I’m trying to create this waterfall animation and I’ve had nothing but problems. Now I keep getting these lines move through my flowing water every few seconds and it really messes up the animation. Does anyone know how to get rid of these? It’s like the water animation is starting over every few seconds and shows these lines…

Hello! Could you please tell me the name of the assets you used? We will try to improve it.