laptop mouse problem

Normally i will use the mouse that is roll around but sometimes I will attach and use a desk mouse to my laptop quite sometime later the up and down rolling on the laptop does not work, dont know why it happens so and i tried to switch it on but i cant able to do it.

please help me solve this problem. i want to roll up and down easily.

sometime later the up and down rolling on the laptop does not work

Does it work at first? Or part of the time? Or does it not work at all?

Also, does this happen in every application (or just Konqueror, for example)?