What would cause branches to suddenly fall off of a large Norfolk Pine tree?

Question

I heard a lot of popping and saw a cloud of dust when a bunch of branches suddenly came crashing down from a Norfolk Pine. There was no wind or rain to cause this.

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Answer 1

One can conclude that the tree was compromised in some way; insects, disease, or inappropriate care.
Here are links to some probable pests or disease issues with the Norfolk Island Pine.

A close up inspection of the trunk and needles may help.

https://www.gardeningknowhow.com/houseplants/norfolk-pine/norfolk-dropping-branches.htm

https://www.ctahr.hawaii.edu/oc/freepubs/pdf/C1-453.pdf