cron jobs would have no business reconfiguring networking....
Ok, I'll have to go through the logs and see what happened at around 5am this morning that borked it.
EDIT:
Got these...will look through the other logs. Weird how it happened at exactly 5am this morning.
Mar 26 05:00:43 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:44 freenas kernel: <118>Mar 26 05:00:43 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:44 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:44 freenas kernel: <118>Mar 26 05:00:44 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:44 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:44 freenas kernel: <118>Mar 26 05:00:44 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:44 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:44 freenas kernel: <118>Mar 26 05:00:44 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:45 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:45 freenas kernel: <118>Mar 26 05:00:45 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:47 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:47 freenas kernel: <118>Mar 26 05:00:47 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:51 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:00:51 freenas kernel: <118>Mar 26 05:00:51 freenas mDNSResponder: mDNSPlatformSendUDP got error 51 (Network is unreachable) sending packet to 224.0.0.251 on interface 0.0.0.0/lagg0/4
Mar 26 05:01:20 freenas nmbd[2459]: [2016/03/26 05:01:20.462297, 0] ../source3/libsmb/nmblib.c:873(send_udp)
Mar 26 05:01:20 freenas nmbd[2459]: Packet send failed to 10.2.10.255(138) ERRNO=No route to host
Mar 26 05:01:20 freenas nmbd[2459]: [2016/03/26 05:01:20.462678, 0] ../source3/lib/util_sock.c:396(open_socket_in)
Mar 26 05:01:20 freenas nmbd[2459]: bind failed on port 137 socket_addr = 0.255.255.255.
Mar 26 05:01:20 freenas nmbd[2459]: Error = Can't assign requested address
Mar 26 05:01:20 freenas nmbd[2459]: [2016/03/26 05:01:20.462783, 0] ../source3/nmbd/nmbd_subnetdb.c:127(make_subnet)
Mar 26 05:01:20 freenas nmbd[2459]: nmbd_subnetdb:make_subnet()
Mar 26 05:01:20 freenas nmbd[2459]: Failed to open nmb bcast socket on interface 0.255.255.255 for port 137. Error was Can't assign requested address
Mar 26 05:01:20 freenas nmbd[2459]: [2016/03/26 05:01:20.462874, 0] ../source3/nmbd/nmbd.c:362(reload_interfaces)
Mar 26 05:01:20 freenas nmbd[2459]: reload_interfaces: No subnets to listen to. Waiting..
Mar 26 05:01:20 freenas nmbd[2459]: [2016/03/26 05:01:20.463039, 0] ../source3/lib/util_sock.c:396(open_socket_in)
Mar 26 05:01:20 freenas nmbd[2459]: bind failed on port 137 socket_addr = 0.255.255.255.
Mar 26 05:01:20 freenas nmbd[2459]: Error = Can't assign requested address
Mar 26 05:01:20 freenas nmbd[2459]: [2016/03/26 05:01:20.463135, 0] ../source3/nmbd/nmbd_subnetdb.c:127(make_subnet)
Mar 26 05:01:20 freenas nmbd[2459]: nmbd_subnetdb:make_subnet()
Mar 26 05:01:20 freenas nmbd[2459]: Failed to open nmb bcast socket on interface 0.255.255.255 for port 137. Error was Can't assign requested address
Mar 26 05:01:20 freenas nmbd[2459]: [2016/03/26 05:01:20.463300, 0] ../source3/lib/util_sock.c:396(open_socket_in)
Mar 26 05:01:20 freenas nmbd[2459]: bind failed on port 137 socket_addr = 0.255.255.255.
Mar 26 05:01:20 freenas nmbd[2459]: Error = Can't assign requested address
The errors above kept looping forever. Lucky I woke up early this morning and saw it.