Problem in subsequent calls to PARDISO MKL

I am using INTEL MKL PARDISO to solve Laplace equation. However, the Matrix becomes more sparse every time I call PARDISO due to my physical problem. PARDISO works perfectly fine until it fails at the stage phase = 11. I was thinking it was because of the very sparse shape of the MATRIX after some iterations. Afterwards, I saved the MATRIX for which the PARDISO failed and I re-used my program with the last MATRIX that I saved and PARDISO works again perfectly fine until it fails after a random number of calls. It may be 1000 calls or more or less. 

Is there any known issue about that ? 

Thanks