Lenovo ThinkPad L R/SL :: Left Mouse Button Stay Held When Dragging On L530

on an L530, when i click and hold the left mouse button on the trackpoint while performing a "sweep" operation -- ie dragging out a rectangular area on the display -- the button doesn't stay held; it prematurely unclicks / releases before i lift my finger off the button.

i had this problem with the original keyboard.  i called support, they quickly shipped a replacement keyboard, and almost as quickly the problem reoccurred.

this is annoying, because i frequently perform mouse sweeps (almost exclusively in conjunction with "snipping tool" on win7).  invariably, i need to retry the sweep 2,3,4,5,6.... times before i'm successful at getting what i want.  and i'm pressing down on the button with significantly more force than should be required.

this isn't a problem that develops over time; it's there from the get-go.

i've phoned in to support again, and they're shipping me a 3rd keyboard.  sounds like a design flaw, since the same problem's shown up on 2 keyboards.  (progress has been made, however; on the original keyboard, F10 wasn't working reliably either; on the now-in-use 2nd keyboard, F10 works fine.)  hope i'm wrong about the chronic failure, and 3rd time's a charm...