How to create static IP in Samba4/DNS?

I am running Slacware64 14.1, Samba 4.1.11 and bind 9.9.5-P1. I am running this host as an AD/DC. I have provisioned the Samba DC specifying BIND9_FLATFILE backend, which basically means using the normal bind config files. This setup has been running fine for around 9 months.

Now, I have a couple of devices, e.g. printer, DVR, for which I want to add static IPs. I've done this in a pre-Samba DNS by adding the following line the to the zone file:

$TTL 14400      ; 4 hours
ricoh                   A       192.168.0.20

and similarly to the reverse zone file:

$TTL 14400
20     PTR    ricoh.hprs.local.

I did this yesterday, but after some period of time, the A record entry from the zone file had disappeared altogether. Samba does update these files, but why would the A record go away? Or, maybe I configured it wrong.

Can someone help me out with getting this IP set correctly?

Below is the zonefile in question (lots of Samba added stuff)

$ORIGIN .
$TTL 14400      ; 4 hours
hprs.local              IN SOA  mail.hprs.local. hostmaster.hprs.local. (
                                2014094808 ; serial
                                10800      ; refresh (3 hours)
                                3600       ; retry (1 hour)
                                28800      ; expire (8 hours)
                                3600       ; minimum (1 hour)
                                )
                        NS      mail.hprs.local.
                        A       192.168.0.2
$ORIGIN hprs.local.
_kerberos               TXT     "HPRS.LOCAL"
$ORIGIN _msdcs.hprs.local.
48c0208f-0646-42f6-89bf-dc9b81b3442c CNAME mail.hprs.local.
$ORIGIN _tcp.Default-First-Site-Name._sites.dc._msdcs.hprs.local.
_kerberos               SRV     0 100 88 mail.hprs.local.
_ldap                   SRV     0 100 389 mail.hprs.local.
$ORIGIN _tcp.dc._msdcs.hprs.local.
_kerberos               SRV     0 100 88 mail.hprs.local.
_ldap                   SRV     0 100 389 mail.hprs.local.
$ORIGIN _msdcs.hprs.local.
_ldap._tcp.e261d59e-e2f2-4202-9caa-b0ebf8d106a5.domains SRV 0 100 389 mail.hprs.local.
gc                      A       192.168.0.2
$ORIGIN gc._msdcs.hprs.local.
_ldap._tcp.Default-First-Site-Name._sites SRV 0 100 3268 mail.hprs.local.
_ldap._tcp              SRV     0 100 3268 mail.hprs.local.
$ORIGIN _msdcs.hprs.local.
_ldap._tcp.pdc          SRV     0 100 389 mail.hprs.local.
$ORIGIN _tcp.Default-First-Site-Name._sites.hprs.local.
_gc                     SRV     0 100 3268 mail.hprs.local.
_kerberos               SRV     0 100 88 mail.hprs.local.
_ldap                   SRV     0 100 389 mail.hprs.local.
$ORIGIN _tcp.hprs.local.
_gc                     SRV     0 100 3268 mail.hprs.local.
_kerberos               SRV     0 100 88 mail.hprs.local.
_kerberos-master        SRV     0 100 88 mail.hprs.local.
_kpasswd                SRV     0 100 464 mail.hprs.local.
_ldap                   SRV     0 100 389 mail.hprs.local.
$ORIGIN _udp.hprs.local.
_kerberos               SRV     0 100 88 mail.hprs.local.
_kerberos-master        SRV     0 100 88 mail.hprs.local.
_kpasswd                SRV     0 100 464 mail.hprs.local.
$ORIGIN hprs.local.
$TTL 1200       ; 20 minutes
BETH                    A       192.168.0.53
$TTL 3600       ; 1 hour
                        TXT     "31fb00b7a77fdc7f6ba1e7a3a8efaeb764"
$TTL 1200       ; 20 minutes
CHARMAINE               A       192.168.0.52
$TTL 3600       ; 1 hour
                        TXT     "31e495ab9beab3bba63ae1165feab6d82f"
$TTL 1200       ; 20 minutes
COMMON                  A       192.168.0.58
$TTL 3600       ; 1 hour
                        TXT     "31d43f065d80a9e1d8507c919ea920a677"
$TTL 1200       ; 20 minutes
DENNIS                  A       192.168.0.57
$TTL 3600       ; 1 hour
                        TXT     "31616d4148a7bea9e6aba53e934e9a3766"
DOMAS1286P12141         A       192.168.0.114
                        TXT     "31692eef51b0eaa0d31d250455d1c2c625"
$TTL 1200       ; 20 minutes
DORIS                   A       192.168.0.51
$TTL 3600       ; 1 hour
                        TXT     "318d9a2029644a1b54e80551bba7682954"
$TTL 1200       ; 20 minutes
HOLLY                   A       192.168.0.56
$TTL 3600       ; 1 hour
                        TXT     "3125e48aa8400fcddf72791dc5bb93bca7"
LocalHost               A       192.168.0.24
                        TXT     "31d0ef7b30ac56944e0d01b8d43a43123a"
$TTL 14400      ; 4 hours
mail                    A       192.168.0.2
$TTL 1200       ; 20 minutes
MARK                    A       192.168.0.55
$TTL 3600       ; 1 hour
                        TXT     "312e7db07ef48b5b5c1c74dca37fc455d0"
MCNEA1953C11141         A       192.168.0.112
                        TXT     "3133784f6dadce841246963acdf6ffa25c"
$TTL 1200       ; 20 minutes
MIKE                    A       192.168.0.54
$TTL 3600       ; 1 hour
                        TXT     "3123e28f0b7a5150ca7bf29e91967928c2"
OHPRSstorage            A       192.168.0.5
                        TXT     "00809cfa69f150af1ca3924d33b7dbd20e"
$TTL 1200       ; 20 minutes
RENEE                   A       192.168.0.50
$TTL 3600       ; 1 hour
                        TXT     "31a3fe008f43cb09a0b5e55cf7a3322f26"
$TTL 1200       ; 20 minutes
server                  A       192.168.0.4
$TTL 3600       ; 1 hour
                        TXT     "3142f0ea1580f4cfde5bfb712dc2dc8482"
$TTL 1200       ; 20 minutes
TRAVERSE                A       192.168.0.59
$TTL 3600       ; 1 hour
                        TXT     "31d1e2072b79d455b24818ec52267dc0b6"
viao                    A       192.168.0.102
                        TXT     "319fa2220f0f1c778d2667ee0e19bbb60d"
webserver               A       192.168.0.3
                        TXT     "00a72c84d5da5a7047247078f738268ec3"

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