Hello,
as you can see in the video, there is a nasty bucket flickering on the character (Vray AL Surface Material)
https://pipe.green-cloud.at/index.php/s/wdpRwY8DbBekj4L
Rendering with GPU RTX
perhaps there is a way to avoid it - others I switch to an SSS 
thnx
Martin
just tried with SSS Material
does the same thing
will render in progressive (not bucket)
also artefacts happened in progressive mode
I changed to a standard mtl
Have you tried without adaptive dome light or just rendering brute force? This looks like an issue that came up frequently and has never been solved.
Edit:
https://forums.chaos.com/forum/v-ray-for-maya-forums/v-ray-for-maya-problems/1112868-adaptive-dome-light-and-light-cache-issue/page2
@pipe_mm Could you strip down the scene and send it via the contact form so we can take a look? Mention me and include a link to this thread.
thanks Hermit_Crab for your kind offer.
I did the trick using a standard MTL.
there is a lot going on in the scene: referenced rig, displacement, motion blur … all the good stuff
so for this round I am happy its out 
Using Progressive mode is not a bad idea for V-Ray GPU, it is what we recommend for now
We are working on improving bucket mode at the moment, if you have time to upload a simple version of your setup it will be very helpful
Best,
Muhammed