Will Canon 700d hurt the camera when shooting video?

My first 5D3 was bought as a video camera, which took two years and took more than 400 hours. Now it looks brand new ~

I just bought the second 5D3 the day before yesterday. Compared with the two, the old machine has begun to have faintly visible thermal noise in the same scene. At the same color temperature, the picture of the old machine is obviously red, and the noise in the material is higher than that of the new machine ~

There is little difference in taking pictures, but the noise is a bit high ~

Compared with the camera of the same level, the image quality of SLR is not bad, but why it is cheap is because it doesn't have a complete cooling system. When the SLR camera is turned on for a long time, the sensor temperature will rise and the heat will not be discharged ~

But depending on what you think, my old 5D3 earned me more than ten times the capital, so I think this problem is nothing ~