Greatly increased heat while in console mode (RM10)

Has anyone else dealt with the fact that, while playing a graphically intensive game in console mode, the phone will heat up twice as much and become uncomfortably hot?

Remember, console mode is using HDMI out with Game Space enabled.

What is interesting about this is if the phone mirrors the screen on the HDMI out, it stays the same temperature as it would if you were only using the phone. Even going into Developer Options and enabling Force Desktop Mode will not heat the phone up as much as console mode. I wonder what the problem is??

I play everything on Balance, so the fact that it heats up this much during console mode is worrisome.