High pressure fluctuations with ReaxFF

Dear lammps users

I am trying to deform polyethylene using fix deform command with ReaxFF with NPT ensemble. But I am getting huge pressure fluctuations in pressure pxx, pyy and pzz. How can I avoid these fluctuations? This may not be lammps specific question but experienced users can answer it.



Is it crystalline or amorphous PE? You could increase the model size to reduce noise.