Nitro is just a marketing term for their high end models, they usually have the Pulse which is the base and the Nitro(+) that has additional features like removable fans.
They cost more but they tend to have a better build quality, but the chip inside is the same.
The only two things I can currently think of are:
Honestly I’m not sure if it will help but I don’t have other ideas aside from purging the configuration, which is probably not the solution and unwarrented.
Another thing to try would be a search on the KDE bugtracker.