Sounds to me like a systemd problem. What database server are you running? MySQL or MariaDB. Freeswitch needs to start after the database and the way to do that is with the systemd unit file.
Add this systemd file to /etc/systemd/system and modify the first part if using mariadb instead of MySQL so it waits until the database has started.
[Unit]
Description=freeswitch
After=syslog.target network.target local-fs.target mysql.service
[Service]
Type=forking
RuntimeDirectory=freeswitch
PIDFile=/run/freeswitch/freeswitch.pid
Environment="DAEMON_OPTS=-ncwait -nonat"
EnvironmentFile=-/etc/default/freeswitch
ExecStart=/usr/bin/freeswitch $DAEMON_OPTS
TimeoutSec=45s
Restart=always
User=www-data
Group=www-data
LimitCORE=infinity
LimitNOFILE=100000
LimitNPROC=60000
LimitSTACK=250000
LimitRTPRIO=infinity
LimitRTTIME=infinity
IOSchedulingClass=realtime
IOSchedulingPriority=2
CPUSchedulingPriority=89
UMask=0007
; Comment this out if using OpenVZ
CPUSchedulingPolicy=rr
[Install]
WantedBy=multi-user.target