Automation set for sunset comes on 2 hours early

I have an automation set up for turning on some outside lights at sunset without any delay. Quite often they come on 2-4 hours prior to sunset. I’ve called Hue several times and they give me the standard response; delete the automation and re-create it, turn off your phone/tablet and restart, delete the Hue app and reload. None of these work. Anyone else had this problem and found a solution? Thanks in advance,
Pappy