Hi,
All the time these kind of things happened to me was to do with bad collision lines, so there are 3 things you can do:
1) Double check your collision lines to make sure you have PERFECT boxes or circles.
2) If you are using 5 invisible rectangles for the box collision change it to 2 rectangles: 1 big one and one middle line.
3) If nothing works consider setting a limit on the speed of the rotation of the box to avoid this problem.
Good luck