I had vinyl bead board installed on my lanai ceiling and used Brian Terry Vinyl 352-461-0503.

Lanai cracks
 

Would you think there is a possibility of a home inspector crawling around in attic may have caused the cracks? Just a thought

I would got to box store get some fix a crack in can, fill in crack, repaint ceiling if I couldn’t match the paint. Then I would have the material product to fix anymore cracks and paint that matches.

We had one, not as bad but I took silicone and filled it in, roughed up and you can't see it. I think the heat and cool does it more than anything. When the sun hits it I hear creek and when open windows to cool it, it creeks again. Did this 3 years ago and still can't find it if you look.

I'm like this poster. I patched the crack, painted over it and you can't see it at all.
Quick, easy, cheap fix and years later looks just fine. If it were to re-crack, I'd do something sturdier as mentioned on the prior post.

Insulate the space above before doing the fix

My painter noticed a long crack in my bedroom ceiling and mentioned it to me. I have been living here since 2001. I told the painter that I had that crack fixed twice and the 2nd guy said that it will probably come back. I would not have had it done if I knew it would come back. He told me this after he did the work. Sure enough, it came back within a year.
The painter suggested A Touch of Drywall, Inc. Lori is the owner, she came and gave me an estimate which was lower than what I had paid the last time. She covered the bed and furniture, took apart a section of the drywall, put it back together and it was perfect. That was at least 6 years ago. She told me that you can't just patch it or it will come back. The other 2 just patched the crack and that is why it came back. Her phone # is 352-636-6859. Lori is licensed and insured. She is a real pro with drywall.

Lori is excellent

Highly unlikely. It’s a very common issue here.

Most of the cracks in Lanai ceilings are due to it not being insulated from the heat of the attic.

It doesn't help that they don't use the best drywall or the best joint compound, but the biggest culprit is heat.