My avocado tree has small avocados and something seems to be chewing the stems to the avocado and causing them to fall off.
Certified GKH Gardening Expert
Are any of the leaves damaged with holes? Is there any damage to the avocado fruit besides the stem being snipped?
Here are some links that will help you to identify the culprit:
Avocado: Causes of Fruit Damage:
Avocado: Other Invertebrates and their damage: