Just back from a cruise to the north pole. (Well not quite but pretty close) and met an electrician who was very knowledgeable about our problem with the flickering lights in the late afternoon.
For those of you who said it was an LED bulb or two causing this give yourselves a pat on the back. Apparently it is the electronics in led bulbs.
Changed three bulbs and problem has gone away. Would have changed the other two but that was all the dimable bulbs we had.
Thank all for your suggestions.
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