This also happens to me. But the circumstances a rare. I.e rendering video
given your description i think your issue is way different from his. check out his video - that is definitely not normal.
I am working on my device right now, not in a quiet office - and I can hear the electrical whine/buzz from my V internals while it is charging. This really gives me little faith that it isn’t about to do a “Samsung” at some point and suddenly cook itself.
I have emailed Support and referenced this thread, will see what the response is.