I've had my rabbit for 3 years. Great bunny, just one major problem... Her nighttime thumping. She thumps approx 2 - 40 times a night. I've put her cage in a large closet, with the light on; and music to keep her from hearing the small sounds. This still isn't working, thisspring it's gotten much worse. Last night I got up 3 times to reassure her. Any suggestions?