CYREN subscription expired - problems with AXIGEN staying up

Our maintenance ran out for Axigen and connected applications, CYREN in particular. It caused AXIGEN to completely seize up. I have now had to reboot the mailserver (running CENTOS) twice in two days. Even though I was told to disable CYREN it seems something else is happening. We have a perpetual license for 50+ users. Something is awry

Anyone have any pointers?

Any logs?
What else is installed?