I too have now plagued me months to the "double issue". The mouse makes apparently what you want - in the form of days. Time a click is in pairs, again not. Highlight text, minimize / maximize window, select files etc ... so is torture. Actually I wanted to write off the mouse already lengthens, but I like how it is. Servicing is easily possible: Remove the battery cover, batteries out, remove sticker in the battery compartment, upper "Glidepad" pry on the mouse using a screwdriver. Remove all screws, remove cover (Caution: mouse body are connected via cable, simply peel off!). Now you can see on the right and left of the wheel two microswitches. Spray some WD40 Einwach in a glass, in a pair of tweezers and dip a bit wet the microswitch. After assembling.