NSD4 occassionally fails to start after _server_ restart -- related to log rotation?

I've built/installed

    /usr/local/nsd4/sbin/nsd -v
        NSD version 4.1.25
        Written by NLnet Labs.

        Copyright (C) 2001-2006 NLnet Labs.  This is free software.
        There is NO warranty; not even for MERCHANTABILITY or FITNESS
        FOR A PARTICULAR PURPOSE.

Runs well.

On server restart, I find occassionally that NSD4's not UP.  starting it
manually is immediately successful.

I've found, so far, no relevant errors in systemd journal or nsd logs.

I did noticed, checking immediately after noticing one of these^ 'bad'
restarts,

    systemctl status -l nsd4-custom
        ● nsd4-custom.service - NSD4 DNS Server
           Loaded: loaded (/etc/systemd/system/nsd4-custom.service;
enabled; vendor preset: disabled)
!!!           Active: inactive (dead) since Wed 2018-10-17 11:14:41 PDT;
30min ago
          Process: 1367 ExecStopPost=/bin/rm -f
/var/chroot/nsd4/var/db/nsd/xfrd.state (code=exited, status=0/SUCCESS)
          Process: 1296 ExecStop=/usr/local/nsd4/sbin/nsd-control -c
/var/chroot/nsd4/etc/nsd.conf stop (code=exited, status=0/SUCCESS)
          Process: 1280 ExecStart=/usr/local/nsd4/sbin/nsd-control -c
/var/chroot/nsd4/etc/nsd.conf start (code=exited, status=0/SUCCESS)
         Main PID: 1280 (code=exited, status=0/SUCCESS)

>>>        Warning: Journal has been rotated since unit was started. Log
output is incomplete or unavailable.


Don't know if that's 'fatal' to nsd.

I launch nsd with systemd,

    cat /etc/systemd/system/nsd4-custom.service
        [Unit]
        Description=NSD4 DNS Server
        After=syslog.target network-online.target
        Before=nsd4-custom.target
        Before=unbound.service
        Requires=unbound.service

        [Service]
        PIDFile=/var/chroot/nsd4/var/run/nsd/nsd.pid
        ExecStart=/usr/local/nsd4/sbin/nsd-control  -c
/var/chroot/nsd4/etc/nsd.conf start
        ExecReload=/usr/local/nsd4/sbin/nsd-control -c
/var/chroot/nsd4/etc/nsd.conf reload
        ExecStop=/usr/local/nsd4/sbin/nsd-control   -c
/var/chroot/nsd4/etc/nsd.conf stop
        ExecStopPost=/bin/rm -f /var/chroot/nsd4/var/db/nsd/xfrd.state

        [Install]
        WantedBy=multi-user.target

and rotate logs with

    cat /etc/logrotate.d/nsd4
        /var/log/nsd4/*.log {
            daily
            missingok
            rotate 14
            compress
            delaycompress
            compresscmd /usr/bin/xz
            uncompresscmd /usr/bin/unxz
            create 640 nsd nsd
            sharedscripts
            dateext
            dateformat .%Y-%m-%d.%s
            postrotate
                /usr/local/nsd4/sbin/nsd-control log_reopen
            endscript
        }

Is any of that^ problematic, possibly causal?  Or is there some other place
I should be looking?

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