You should absolutely remove them before they begin to fall off.
Letting them grow until they fail structurally is an all-around bad idea for your nails.
Unbalanced acrylics tend to have a small pocket of air or water under them once they begin to separate from the natural nail.
How long will it take for acrylic nails to fall off?
What do you do when acrylic nails fall off?
Soak off any remaining acrylic nail
Once the acrylic has been filed down much as possible, Walker recommends soaking the nails in 100% acetone for as long as it takes to dissolve the product. There are two ways to do this. One way, Walker says, is to wrap each fingertip in foil with an acetone-soaked piece of cotton.
How do I keep my acrylic nails from popping off?
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Tammy Taylor – How to Eliminate Acrylic Nails From Lifting – YouTube
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