Tkaiser, I have been the latest Xenial image you put out and it looks like it's thermals are better than the previous version.
But the unit still will just thermal runaway and crash if there is no airflow.
I have disabled the 3 extra cores that I don't need but it makes not effect on the thermals also only a 30Ma reduction in current draw.
17:42:57: 240MHz 0.43 12% 9% 0% 2% 0% 0% 79°C
and crash.