This isn't a huge problem, but sometimes my week-old Inspiron 15 will act like the control key is pressed when it's not.  So for instance when I'm typing an email in Firefox a new tab will suddenly open up when I press the "t" key (because ctrl+t = new tab).  Or suddenly all my text will be selected when I press the "a" key (because ctrl+a = select all).  It doesn't happen with great frequency and seems to happen more when I have my left hand resting on the palmrest (even though it's not touching any keys).  No new drivers are available for my keyboard, and the Device Manager says the keyboard is working properly.  Any thoughts on what's causing this and how I can fix it?  Thanks.