Crashing and slow down ... could it be too many cloud drives?

Yesterday I experienced Tablet stylus input not responding to my screen touch. Today I experienced system not responding on my home desktop, and even system crash on my office laptop, all AFTER I installed all three cloud drives (Zumo Drive, DropBox, SugarShare) on my office laptop, home desktop and my tablet. So let me remove most of those cloud drives (except DropBox which needs to continue working on my office machine), and see if my problem goes away later.