Computer: 2013 Macbook Air
OS: OSX 10.9.5
Tablet: Wacom Intuos4 (about...3 years old maybe? Give or take?)

Problem: Every few minutes my pen will just....stop working for about 10 sec. I'm not sure if it's the tablet, the cord, or the pen. When it stops working, the lights on the tablet dim but don't go out, and when it starts working they go back to full brightness.

I've tried uninstalling and reinstalling the tablet software but that's about it. It's more just an annoyance at this point, but I'm worried it will get worse.