Yes it is and that’s why they came off LOLI think the Poll is a relative "Landslide" right now lol, should make answering your own question really easy lol
I let my mini hover for about five minutes and it kept saying over and over again max power load reached but then I took off the covers and I did have that issue data was fine.I mounted simple aluminum ones, and so far no problem. I have seen several tests on You Tube, and none demonstrate overheating.
We'll see !