Weird lines on my Canon EOS R

[Ctheophin]

Weird lines suddenly appeared on my Canon EOS R camera display, making it look like a bad TV. And after doing a shoot it also appeared in the final videos and photos. Does anyone know how to fix this issue? Attached screenshots of the video footage below

[ctitanic]

Do you see the lines when shooting outdoor or good light?

It seems to me that those lines are relative to the use of high ISO because of the poor lighting conditions. Also the light source can cause banding.