I see some dropped dhcp packets:
root@SRX1# run show dhcp server statistics Packets dropped: Total 193 No available addresses 193 Offer Delay: DELAYED 0 INPROGRESS 0 TOTAL 0 Messages received: BOOTREQUEST 193 DHCPDECLINE 0 DHCPDISCOVER 193 DHCPINFORM 0 DHCPRELEASE 0 DHCPREQUEST 0 DHCPLEASEQUERY 0 DHCPBULKLEASEQUERY 0 Messages sent: BOOTREPLY 0 DHCPOFFER 0 DHCPACK 0 DHCPNAK 0 DHCPFORCERENEW 0 DHCPLEASEUNASSIGNED 0 DHCPLEASEUNKNOWN 0 DHCPLEASEACTIVE 0 DHCPLEASEQUERYDONE 0