Video output freez sometime while using GPU and no problem with integrated

Hi. I´m writing this looking for same help

My relevant Macbook Pro spec:

- CPU: Quad-core I7 @ 2.3Ghz
- RAM: 16 GB
- Video: nVidia Geforce 750m (2gb GDDR5) 

The fact is the problems/bugs I have are iGPU/dGPU dependent
The problems indeed are random little-freez that are still visible from the audiencie, and even more there, it freez muy GUI also

What is really contra-intuitive is that when I use integrated GPU those glitches disappear and everything works as expected, but when I turn back to the discrete performance lowers down