something simmilar happens on macbook pro 15" too - gpu with MacOS 10.14.6 Mojave - usage (either intel or amd radeon - whichever is in use) steadily goes to over 50% and consequently fans kicks in and machine gets got in few minutes with battery life going quickly down.
I have noticed that it’s happening every time when this specific animated element is displayed on the screen:
Once I go to other section of roon, like for e.g. “Overview” the gpu usage goes down to normal (10-15%)
hope this helps to isolate the problem