I am in the Phoenix area and must admit I have never experienced this.
Do you ever park your car outside during the day when shopping, dining, etc ?
It’s hard to believe the large black metal section of the top that’s right above your head wouldn’t be getting hot in that situation.
i did have my top replaced by a dealer right after the car was purchased due to a minor issue (It was under extended warranty)
So perhaps there’s some insulation between the soft top and that metal piece which was not installed?
Mine gets instantly hot when in the sun.