Laptop freezes when moved or lifted
I just got this Macbook Pro in February of 2013 -- it is less than two years old, but it's already been so much trouble for me. Whenever I seem to lift my laptop or move it in any way, it freezes, showing bars all around my screen and I'm unable to do anything but hold the power button until it turns off. This freezing also occurs randomly, without the computer being lifted/moved, though it is rare.
I can't remember when it first happened, maybe 5 months ago. I took it to Geek Squad (since I don't have the Apple Care anymore) and they said they couldn't find anything wrong with the computer, after running a bunch of diagnostics on it. What could this possibly be and why can't the "professionals" find anything wrong with it? I've attached some photos to see if it helps any.