[Dovecot] dovecot crash

I woke up this morning and my dovecot server had died with the following in the dovecot.log file:

pop3-login: Jan 23 10:23:08 Fatal: RAND_bytes() failed: error:24064064:random number generator:SSLEAY_RAND_BYTES:PRNG not seeded

dovecot: Jan 23 10:23:08 Error: Login process died too early - shutting down dovecot: Jan 23 10:23:08 Error: child 16321 (login) returned error 89

How can I find out whats going wrong?