The controller gets very warm while I’m using it. Is this normal?

Yes, this is completely normal. The electrically powered components inside the controller make the controller warm while it’s turned on. We have thoroughly tested the controller under extreme conditions, so you can rest assured that this will not cause any problems. 

However if you begin to feel uneasy because of the warmth, we suggest that you turn off the controller for a few minutes and let it cool down before turning it back on.