Process soffice.bin stops when converting

I am trying to convert documents to pdf with libreoffice 5.3 using a tool like jodconverter on SUSE Linux Enterprise Server.
Libreoffice is being run in headless mode.

Sometimes, LibreOffice does not respond to a request to convert documents. A connection is made via the jodconverter, but the conversion does not occur. Does not give any errors or exceptions. Disappears “soffice.bin” from the list of processes. Helps only to restart LibreOffice.
What could be the problem? And how to solve it?