On the back of the remote is a small reset button. It is near the serial number sticker.
Use the stylus and press it.

It will not do anything to your programming, just reset the remote.
Power cycle the NC-50 as-well.

The only thing that will cause you problems is if you press the reset on the NC-50 for 10sec when you power it back up. This is not a major issue more of a small annoyance as you will need to re-do the z-wave network.

If that does not work call your installer to come and have a look.

D.