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Onycholysis is a condition that causes nails to separate from the nail bed beginning at the distal end of the nail (under the free edge). The nail itself will appear healthy, often maintaining its shape and strength. Techs will be able to see the separation easily on natural nails and through light-colored enhancement products.
As you are suspecting, by far the most common cause of nails falling off is in fact trauma, especially if the trauma smashes down on the part of the nail under the cuticle fold where new nail tissue is formed, temporarily disrupting nail production.