You can give the newer version a try:

Release 0.5.2 - 2018-06-05
Updated to sync with NHML v1.9.0.3
Bundled ethminer 0.14.0 which provides better performance and stability for CUDA devices.
You can still use the "original" version if you like. Benchmark both, and see what works best for you.

Download NicerMiner v0.5.2:
https://github.com/odedolive/NicerMiner/raw/master/releases/NicerMiner%200.5.2.zip

The new ethminer version should provide better performance and stability over the one shipped with NHML.
Give it a try and let me know.

Cheers.