Banding on a Kyocera 4052ci is most commonly caused by worn-out drum units, developer units, a dirty transfer belt, or misaligned color calibration. Try:
Run color calibration (Menu > Adjustments > Color Registration).
Check/clean the transfer belt.
Inspect or replace drum and developer units.
Update firmware and test with internal print pages.
If the problem continues, call for service—most likely, a hardware component must be replaced.