I've had my Surface Pro 3 for 2 weeks now. Very happy with it, but there is one annoying problem. After 10-15 minutes of use(and i'm talking light use - couple of tabs of FF, thunderbird, maybe skype chat) it starts to lag. Trackpad starts having 'drunk' delayed effect, switching between windows is slow, etc. The only way to get rid of it is to reboot. I've checked task magager, everything seems ok. Using i5 4gb model, mostly in descktop view. How can i fix this?