Hello ,
Thank you for posting in the community and sorry to hear about the troubles. Is this with using the Path Tracer or the regular raster engine? Do you have a video to share as an example?
If you are using the Path Tracer I recommend you increase the sample count and turn of the denoiser. Here is a good video explaining the settings for Path Tracer: https://www.youtube.com/watch?v=XlFQ2HbiGvY
Kind regards,
Vincent B.