I just went to get my stuff from my Ender Chest and then it started to close and open rapidly! I thought it was really funny but it needs to be fixed. XD

Was this a single player or multi-player/LAN game?
Single Player
Was the issue corrected after logging out and back in?
Yes and No. It fixed itself then started to do it again after 5 minutes in the world.
Was the issue corrected after closing the program and restarting?
Same answer as above.
Have you been able to reproduce this?
Once. It will only happen every odd time.