I would look into some sort of possible medical issue like reflux or gas pain. (babywisemom.com)
Be aware of possible medical issues that can prevent him from eating a lot at a time (like reflux). (babywisemom.com)
Prevention is the best action you can take when caring for any animal, so we have also included some insightful articles to help get ahead of possible medical issues your rabbit may develop. (houserabbitga.com)