2950 IP changing randomly

This is a truly odd situation, I have a 2950 running IOS version 12.1(22)EA4 and I have set up probably hundreds of Layer 2 switches, and I set interface vlan to a static ip within 24 hours it changes itself to a dhcp ip address. I thought someone was messing with me at first so I locked it down hardcore but yet it still changes to dhcp. There are no funky service commands on the switch. Anybody got a clue on this one?

Sanitized Config as requested:
Current configuration : 1285 bytes
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
hostname Beijing-2950
enable secret xxxxxxxxxxxxxxxxxxx
ip subnet-zero
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
interface FastEthernet0/1
interface FastEthernet0/2
interface FastEthernet0/3
interface FastEthernet0/4
interface FastEthernet0/5
interface FastEthernet0/6
interface FastEthernet0/7
interface FastEthernet0/8
interface FastEthernet0/9
interface FastEthernet0/10
interface FastEthernet0/11
interface FastEthernet0/12
interface FastEthernet0/13
interface FastEthernet0/14
interface FastEthernet0/15
interface FastEthernet0/16
interface FastEthernet0/17
interface FastEthernet0/18
interface FastEthernet0/19
interface FastEthernet0/20
interface FastEthernet0/21
interface FastEthernet0/22
interface FastEthernet0/23
interface FastEthernet0/24
interface Vlan1
ip address xxx.xx.140.250 255.255.255.0
no ip route-cache
ip default-gateway xxx.xx.140.249
ip http server
line con 0
password xxxxxxxxxxxx
login
line vty 0 4
password xxxxxxxxxxxx
login
line vty 5 15
password xxxxxxxxxxxxx
login
end

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2950 IP changing randomly

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