MMM getting HOT!

Today I practiced for about an hour and 45 minutes straight, running packs back to back, and temps never got above 150 on ESC. Geared 16/48 on a losi 8ight with 2200. Ran my first heat (7 min) with same gearing and thermalled at 225F! Could not figure out why! No binding anywhere, fan was on, mesh was fine, gearing did not change, so something must have happened. Ran the same packs I did while practicing. For my second heat I dropped to a 14t pinion (undergeared) and I was still at 199F by the end of the 7 mins. I ran my 15 min main and thermalled twice. What could be making it get hot like this? I am not running it all that much harder during the races than I am during practice. It is just getting dangerously hot.