Cube Rotation Problem

Hello,

i am rotating cube and getting problem.

1) when rotate left to right is work ,another time left to right is work.

2) when rotate top to bottom is work ,another time top to bottom is work.

but in 3rd n 4th situation not work perfectly.

1) when rotate left to right is work ,another time top to bottom is not work.

2) when rotate top to bottom it work ,another time left to right is not work.

i found problem but not getting solution.

Problem is rotating in x-axis. when i rotate cube in x angle , value of angle x change 270 - 0 - 90. angle x not greater then 90 if increase then y and z angle changed.same as 270.

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