Problem with screen image through the lens

Hello, yesterday I was making the shooting, and while I was taking a picture with using the zoom, the picture on the screen through lense suddenly became very ruffle while shooting, with many bright strips, colors became distorted, an image turned into like on a very old TV with ripples. The pictures done look the same in the gallery plus when I turn on the camera I see the same effect on the screen through the lense. I was very gentle with my camera, I don’t know why It happened. Previousy the image was very clear like I look through the clear glasses. Please, If you know what to do, help me with this. Thank you in advance.