I just bought a brand new MBP 16 inch in Feb 2021 and now getting it replaced because of the same issue.
It is highly disappointing how neither Apple nor AMD are heeding to any of these complaints and ignoring so many disappointed customer complaints.
This just demonstrates how both these companies are so very keen on emptying their customer's pockets and once they have done that, they just forget about the woes and move on to the next, even more costlier products duping their customers.
Highly disappointed with Apple.
I have the same issue. The kernel_task process goes through the roof in CPU consumption.
The only way to work is connecting and disconnecting the external screen every 30min ..... with which, all the enjoyment I have had with apple products goes down the toilet with this investment of more than € 3000, a shame dear Tim Cook.....
Apple needs to do something about it or we'll see to it that this goes to press shortly.
Highly disappointed with Apple too.