I'd expect the crashing process to be the one which has too many opened file handles.

On a unixish system you can also consult the output of lsof.

BTW when you write result of top command show CPU% MEM% as 0/1 for the particular application. I read that as "CPU usage is not a problem", not as "the output isn't helpful for me". Try to actually say what you think, not say something different and hope that everybody else comes to the same conclusions as you.