Burning bush

Question

Burning bush leaves turning red early, not all at once and falling off……versus other burning bushes in the area

Answer 1

Early color changes can be a sign of stress.

Spider Mite infestation is one possible cause.
Heat stress can also cause leaf color change, this is often the case when the bush gets more heat from a planting near a sidewalk or driveway or is getting reflection from a building.

Mechanical damage from mowers or weed wackers could also stress your plant.

https://www.gardeningknowhow.com/ornamental/shrubs/burning-bush/burning-bush-care.htm