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The lock tabs may be broken.
There is a flat screwdriver slot in the plastic piece attached to the visor.
Insert visor into trim piece, insert screwdriver in slot and turn with visor while holding the screwdriver to lock visor in place.
You will hear it lock in place.
If it is still falling ,then you have to replace the visor, if both trim pieces are falling, then you may just need a new locking trim piece.