We are and electrical contractor who has a development which uses the Caseta PD-5NE-WH. We install 6 per house and have been doing so for a couple years. These homes have Progress Lighting P8222-28-30K Flush Mount LED fixtures throughout. We have one house that (2) different sets of these lights start to flicker at 50% dimmed. We have changed dimmers, fixtures, and even wiring. Any suggestions on what could cause this?