Hope this isnt to late, but oh well it might help for the future. I have had the exact same problem as you for about 2 months now, more notebly when watching any form of video... and less often during games/dashboard. Now ive had this problem in the past but I passed it off by getting a new...
btw i feel this a good time to remind you guys that sea of thieves was made by rare, who also made DKC1-3 and DK64, alongside banjo kazooie and conker's bad fur day