I have searched for an answer and am coming up with nothing. I did find you are not the first one with this issue. Are you using the CPU or GPU when rendering? The link below is one on render settings.
go to File then New.
then at View Transform: change it to OFF.
it should be on ACES RRT (sRGB) by defult.
then check START ALL NEW PROJECTS WITH THESE SETTINGS. and click okay.
then you won't get those color bars when you render, Hope this helps.
let me know if you have any other troubles.
Thank you so much mate I had so much trouble trying to render my video and it now works!! I couldn't find any other help except for this comment!! THANK YOU!! My channel is StreetSkillerzzHD if you wanted to take a look!!!
For some reason, when I render i get all these multi colored bars that go all the way across the screen that go up and down. When I'm not rendering its fine. How can I fix this?
I had a problem similar to the way you describe and it was resolve by turning off the GPU. I see you wrote your question a long time ago so hope you have resolved it. I was disappointed to have to turn off the GPU and wonder if I should change my graphic card? Anyway the CPU renders OK so the GPU is not essential