PIX crash after change dmz's IP

[poor]

Hi, all

I have some probelm in PIX 515. The PIX has three interfaces and I only use outside and dmz interface running nat on dmz. There are two servers in dmz and use two outside's ip map to dmz's ip.
static (dmz,outside) 192.9.200.9 192.168.100.9 netmask 255.255.255.255 0 0
static (dmz,outside) 192.9.200.10 192.168.100.10 netmask 255.255.255.255 0 0
The problem is when I change the dmz's IP to outside's IP and put it in outside.
Such as, I change server1 (192.168.100.9) to 192.9.200.9 and plug it to outside. It runs ok and everyone can connect it. But when I change it to 192.168.100.9 again and plug it to dmz. Everyone in outside can't connect it and it can't connect outside except dmz's until I change the mapping such as
"static (dmz,outside) 192.9.200.11 192.168.100.9"
I have reboot the PIX and clear xlate, arp or even I write erase the configure and copy the image from tftp server. The result is same. Could anyone help me? Please.

My PIX 515 configure shows as follow:
pixfirewall(config)# show conf
: Saved
:
PIX Version 5.3(1)
nameif ethernet0 outside security0
nameif ethernet1 inside security100
nameif ethernet2 dmz security50
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
hostname pixfirewall
fixup protocol ftp 21
fixup protocol http 80
fixup protocol h323 1720
fixup protocol rsh 514
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol sip 5060
names
pager lines 24
logging on
no logging timestamp
no logging standby
no logging console
no logging monitor
no logging buffered
no logging trap
no logging history
logging facility 20
logging queue 512
interface ethernet0 auto
interface ethernet1 auto shutdown
interface ethernet2 auto
mtu outside 1500
mtu inside 1500
mtu dmz 1500
ip address outside 192.9.200.1 255.255.255.0
ip address inside 127.0.0.1 255.255.255.255
ip address dmz 192.168.100.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
arp timeout 14400
global (outside) 1 192.9.200.2-192.9.200.4
global (outside) 1 192.9.200.5
nat (dmz) 1 192.168.100.0 255.255.255.0 0 0
static (dmz,outside) 192.9.200.9 192.168.100.9 netmask 255.255.255.255 0 0
static (dmz,outside) 192.9.200.10 192.168.100.10 netmask 255.255.255.255 0 0
conduit permit tcp host 192.9.200.10 eq

http://www any

conduit permit tcp host 192.9.200.9 eq

http://www any

conduit permit icmp any any
route outside 0.0.0.0 0.0.0.0 192.9.200.202 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h323 0:05:00 si
p 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
no sysopt route dnat
isakmp identity hostname
telnet timeout 5
ssh timeout 5
terminal width 80