Have they gone back to normal, and has this ever happened before? Did your rabbit happen to be overly warm when it happened, like from running around? Are you seeing any other symptoms, especially after he's been running or been stressed; symptoms like protruding third eyelids, labored or noisy breathing, excessive sneezing, mouth breathing, seeming to always want to rest with his head in an elevated position, or any other odd symtoms or behavior that you think could be health related? Has he been scratching at his ears excessively at all, or have signs of crusts or wax build up in his ears?