Why does Freeswitch sometimes crash and won't come back up until I delete /var/lib/freeswitch/db?

Question

FreeSWITCH

It has already happened twice that Freeswitch stopped working after a restart until I delete the /var/lib/freeswitch/db folder.
How can I make sure that this does not happen again?

Log

2017-05-26 12:58:50.152456 [ERR] mod_xml_curl.c:315 Received HTTP error 0 trying to fetch chat.inparadise.info:84/directory
2017-05-26 12:58:50.152456 [WARNING] sofia_reg.c:2906 Can't find user from 5.196.149.220
8458ce25-5324-4506-929c-d2bd3813616d 2017-05-26 13:00:25.892463 [WARNING] switch_core_state_machine.c:687 8458ce25-5324-4506-929c-d2bd3813616d sofia/internal/[email protected] Abandoned
2017-05-26 13:03:49.052437 [WARNING] sofia.c:2203 MSG Thread Ended
2017-05-26 13:03:52.376333 [ERR] sofia_glue.c:329 Invalid tls-verify-policy value: none
2017-05-26 13:03:52.376648 [ERR] sofia_glue.c:329 Invalid tls-verify-policy value: none
2017-05-26 13:03:52.377087 [ERR] sofia_glue.c:329 Invalid tls-verify-policy value: none
2017-05-26 13:03:52.377483 [WARNING] sofia.c:2185 MSG Thread 0 Started
2017-05-26 13:03:52.448462 [WARNING] mod_xml_curl.c:294 CURL returned error:[52] Server returned nothing (no headers, no data)
2017-05-26 13:03:52.448536 [ERR] mod_xml_curl.c:315 Received HTTP error 0 trying to fetch chat.ebolit.ru:84/directory
2017-05-26 13:03:52.449524 [WARNING] mod_xml_curl.c:294 CURL returned error:[52] Server returned nothing (no headers, no data)
2017-05-26 13:03:52.449573 [ERR] mod_xml_curl.c:315 Received HTTP error 0 trying to fetch chat.ebolit.ru:84/directory
2017-05-26 13:03:54.517781 [CRIT] switch_loadable_module.c:1522 Error Loading module /usr/lib/freeswitch/mod/mod_ilbc.so
2017-05-26 13:03:54.518404 [CRIT] switch_loadable_module.c:1522 Error Loading module /usr/lib/freeswitch/mod/mod_siren.so
82bfa866-e0ba-4d13-a072-7cbde605d8d9 2017-05-26 13:04:36.045059 [WARNING] switch_core_state_machine.c:687 82bfa866-e0ba-4d13-a072-7cbde605d8d9 sofia/internal/[email protected] Abandoned
a6c401cd-80ba-4a43-a87f-08f176db3654 2017-05-26 13:04:49.385060 [WARNING] switch_core_state_machine.c:687 a6c401cd-80ba-4a43-a87f-08f176db3654 sofia/internal/[email protected] Abandoned
c78ee331-4b6b-4d09-810c-5f8b2e3e6caf 2017-05-26 13:08:51.185064 [WARNING] switch_core_state_machine.c:687 c78ee331-4b6b-4d09-810c-5f8b2e3e6caf sofia/internal/[email protected] Abandoned
2017-05-26 13:09:07.405060 [WARNING] mod_xml_curl.c:294 CURL returned error:[52] Server returned nothing (no headers, no data)
2017-05-26 13:09:07.405060 [ERR] mod_xml_curl.c:315 Received HTTP error 0 trying to fetch chat.ebolit.ru:84/directory
2017-05-26 13:09:07.405060 [WARNING] sofia_reg.c:2906 Can't find user from 5.196.149.220
8bf523bf-c652-4106-868a-3a29af17f55e 2017-05-26 13:11:34.485061 [WARNING] switch_core_state_machine.c:687 8bf523bf-c652-4106-868a-3a29af17f55e sofia/internal/[email protected] Abandoned