Problem with mouse clicks

I have a slide that has a drop down menu on it. When I click on a mouse click area the events should hide several objects and then display an object.  The slide is set to not auto advance.  The mouse clicks in the certain areas seem to work for about 20 seconds and then they fail to work at all.  It is like the functionality of the mouse click areas are timing out.  Can you help me with this? 

Thanks in advance.