Ok the only other thing is maybe when you did water that side of the pot has cooked the roots leading to that branch, its been baked in the hot sun you mention , its also a big plant i wonder how the root ball is doing, the pots look like they are not full ? id top up or set the fabric pot on top of another filled with new soil , ( see if the roots come through and into the next pot ) , ( try filling the pot to the neck first though )