I've had a Surface Pro 3 since they were first released and love it except for one issue... my pen keeps disconnecting. I mainly use the desktop mode on my Surface and always the pen essentially like a mouse to click through the UI. Unfortunately, the pen tip will always at some point lose connectivity and pressing on the screen with the tip does nothing. Interestingly, clicking the purple button on top of the pen always works so the issue seems to be related to just the pen tip. This has been an issue since I first bought this unit and I recently performed a complete restore to see if it would fix the issue, which it didn't. Also, all firmware updates have been applied. Is anyone using their pen as often as me and experiencing this same issue? At this point, I'm not sure if I have a defective unit and/or pen or if this is how it works in desktop mode. Any suggestions are appreciated.