Why parfor doesn't work always?

I have Matlab R2017b installed on my PC. I have a quite heavy program to run on Matlab, so I choose to use parfor since all the computations are indipendent and there are about 4000 iterations. Last week it worked fine on my 4 cores, today it doesn't even if I changed nothing. My code runs until the parfor line, it opens the parallel pool and I can see in tne command window the 4 workers, but after that nothing happens, the CPU goes to zero but Matlab appears busy with no reason. Does anybody know why suddenly parfor stopped working? Thank you

[Jackson Burns]

Can you post the code itself? If we were to try and answer without seeing it, we would just be guessing.

[Pravin Jagtap]

Hello Mirela,

As suggested by Jackson, please share the code so that we can understand the issue in detail.

~Pravin