I live in Kansas City, Missouri. The weather has been extremely hot in the region prior to noticing the bark falling off, the weather was in the 100's for numerous days in a row. This was unusual for our area. The leaves were not all brown, they were like an autumn leave with several colors, but mostly brown colors. There was no split, nor is anything oozing from the trunk. The bark has mostly fallen off on one side predominantly. The bark is falling off at the base of the tree.