Computer goes to sleep after starting game..

I am running MacOS Mojave version 10.14.4. After I play one or two games, right as I load into the game it immediatley puts my computer to sleep. I will have to wake it back up but often times the game has been remade.. I took my computer to a apple store and ran all the diagnostics to ensure it was not a hardware issue. I also play lots of other games that require the same graphic power. Any idea what is going on here? I have checked all the energy saving settings on my computer and if I had hot keys for Alt Tab that might be putting it to sleep.

Also my CPU is running at like 120% now on this patch? Any suggestions on what is going on here. Please help.

Also.. Are you guys working on making league voice chat compatible with this OS?

Thanks,

Kiliwa