I have a Dell Latitude E6420. For about three years I had no problems with the keyboard. Recently however, the keyboard occasionally stops working. This usually happens after I undock it from the PR03X docking station. To fix it. I power off the computer, remove the battery, hold the power button for 10 seconds, and then restart. This always fixes the problem. However, I'm looking for a permanent fix because this problem occurs every two weeks.
I don't have any other problems. Peripherals works fine.