Cisco 1142 Wireless access point intermittently will not authenticate

Hi all,
We have a Cisco 1142 standalone access point, and from time to time I will come into the office and it will not authenticate any users to either our guest or corporate networks. I then have to go in and reboot the access point. After that, it begins to work. Any advice? Here's my configuration below:
Current configuration : 6450 bytes
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
hostname cisco-chiap01
logging monitor errors
enable secret 5 $1$fsD8$CU42/3/Up5AAlL4hQWvvg0
aaa new-model
aaa group server radius rad_eap
 server 172.17.16.12 auth-port 1645 acct-port 1646
 server 172.17.21.10 auth-port 1812 acct-port 1813
aaa group server radius rad_mac
aaa group server radius rad_acct
aaa group server radius rad_admin
aaa group server tacacs+ tac_admin
aaa group server radius rad_pmip
aaa group server radius dummy
 server 172.17.21.10 auth-port 1812 acct-port 1813
aaa group server radius rad_eap2
 server 172.17.16.12 auth-port 1645 acct-port 1646
 server 172.17.21.10 auth-port 1812 acct-port 1813
aaa authentication login eap_methods group rad_eap
aaa authentication login mac_methods local
aaa authentication login eap_methods2 group rad_eap2
aaa authorization exec default local 
aaa accounting network acct_methods start-stop group rad_acct
aaa session-id common
login on-failure log
login on-success log
dot11 syslog
dot11 vlan-name Admin vlan 100
dot11 vlan-name DevNetwork vlan 20
dot11 vlan-name Guest vlan 150
dot11 vlan-name Network vlan 16
dot11 ssid DevNetwork
   vlan 20
   authentication open eap eap_methods2 
   authentication network-eap eap_methods2 
   authentication key-management wpa version 2
dot11 ssid Guest
   vlan 150
   authentication open 
   authentication key-management wpa version 2
   guest-mode
   mbssid guest-mode
   wpa-psk ascii 7 142407060101380B013A3A2670435642
   information-element ssidl advertisement
dot11 ssid Network
   vlan 16
   authentication open eap eap_methods2 
   authentication network-eap eap_methods2 
   authentication key-management wpa version 2
username monkeyman privilege 15 secret 5 $1$ZZ7C$rqimu2FNONdfeacMNGAD/.
bridge irb
interface Dot11Radio0
 no ip address
 ip helper-address 172.17.19.10
 no ip route-cache
 encryption mode ciphers aes-ccm 
 encryption vlan 16 mode ciphers aes-ccm 
 encryption vlan 150 mode ciphers aes-ccm 
 encryption vlan 20 mode ciphers aes-ccm 
 ssid DevNetwork
 ssid Guest
 ssid Network
 antenna gain 0
 parent timeout 120
 speed  5.5 11.0 basic-6.0 9.0 12.0 36.0 48.0 54.0
 packet retries 128 drop-packet
 channel 2462
 station-role root
 rts threshold 512
 rts retries 128
interface Dot11Radio0.11
 encapsulation dot1Q 11
 no ip route-cache
interface Dot11Radio0.16
 encapsulation dot1Q 16 native
 no ip route-cache
 bridge-group 1
 bridge-group 1 subscriber-loop-control
 bridge-group 1 block-unknown-source
 no bridge-group 1 source-learning
 no bridge-group 1 unicast-flooding
 bridge-group 1 spanning-disabled
interface Dot11Radio0.20
 encapsulation dot1Q 20
 no ip route-cache
 bridge-group 20
 bridge-group 20 subscriber-loop-control
 bridge-group 20 block-unknown-source
 no bridge-group 20 source-learning
 no bridge-group 20 unicast-flooding
 bridge-group 20 spanning-disabled
interface Dot11Radio0.150
 encapsulation dot1Q 150
 no ip route-cache
 bridge-group 150
 bridge-group 150 subscriber-loop-control
 bridge-group 150 block-unknown-source
 no bridge-group 150 source-learning
 no bridge-group 150 unicast-flooding
 bridge-group 150 spanning-disabled
interface Dot11Radio1
 no ip address
 ip helper-address 172.17.19.10
 no ip route-cache
 encryption vlan 16 mode ciphers aes-ccm 
 encryption vlan 150 mode ciphers aes-ccm 
 encryption vlan 20 mode ciphers aes-ccm 
 ssid DevNetwork
 ssid Guest
 ssid Network
 antenna gain 0
 traffic-metrics aggregate-report
 dfs band 3 block
 mbssid
 parent timeout 120
 speed  6.0 12.0 basic-24.0 36.0 48.0 54.0
 channel width 40-above
 channel dfs
 station-role root access-point
interface Dot11Radio1.11
 encapsulation dot1Q 11
 no ip route-cache
interface Dot11Radio1.16
 encapsulation dot1Q 16 native
 no ip route-cache
 bridge-group 1
 bridge-group 1 subscriber-loop-control
 bridge-group 1 block-unknown-source
 no bridge-group 1 source-learning
 no bridge-group 1 unicast-flooding
 bridge-group 1 spanning-disabled
interface Dot11Radio1.20
 encapsulation dot1Q 20
 no ip route-cache
 bridge-group 20
 bridge-group 20 subscriber-loop-control
 bridge-group 20 block-unknown-source
 no bridge-group 20 source-learning
 no bridge-group 20 unicast-flooding
 bridge-group 20 spanning-disabled
interface Dot11Radio1.150
 encapsulation dot1Q 150
 no ip route-cache
 bridge-group 150
 bridge-group 150 subscriber-loop-control
 bridge-group 150 block-unknown-source
 no bridge-group 150 source-learning
 no bridge-group 150 unicast-flooding
 bridge-group 150 spanning-disabled
interface GigabitEthernet0
 no ip address
 no ip route-cache
 duplex auto
 speed auto
 no keepalive
interface GigabitEthernet0.11
 encapsulation dot1Q 11
 no ip route-cache
interface GigabitEthernet0.16
 encapsulation dot1Q 16 native
 no ip route-cache
 bridge-group 1
 no bridge-group 1 source-learning
 bridge-group 1 spanning-disabled
interface GigabitEthernet0.20
 encapsulation dot1Q 20
 no ip route-cache
 bridge-group 20
 no bridge-group 20 source-learning
 bridge-group 20 spanning-disabled
interface GigabitEthernet0.100
 encapsulation dot1Q 100
 ip address 192.168.100.3 255.255.255.0
 no ip route-cache
 bridge-group 100
 no bridge-group 100 source-learning
 bridge-group 100 spanning-disabled
interface GigabitEthernet0.150
 encapsulation dot1Q 150
 no ip route-cache
 bridge-group 150
 no bridge-group 150 source-learning
 bridge-group 150 spanning-disabled
interface BVI1
 ip address 172.17.16.251 255.255.255.0
 no ip route-cache
ip http server
no ip http secure-server
ip http help-path http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag
ip radius source-interface GigabitEthernet0 
access-list 1 permit 172.17.16.1
access-list 1 remark Admin network access
access-list 1 permit 192.168.100.0 0.0.0.255
radius-server attribute 32 include-in-access-req format %h
radius-server host 172.17.21.10 auth-port 1812 acct-port 1813 key 7 047958071C3561410D4A44
radius-server host 172.17.16.12 auth-port 1645 acct-port 1646 key 7 08045E471A48574446
radius-server host 172.17.21.10 auth-port 1645 acct-port 1646 key 7 1320051B185D56797F
radius-server timeout 15
radius-server vsa send accounting
bridge 1 route ip
line con 0
line vty 0 4
 access-class 1 in
end

When the issue occurs does that affect both 2.4GHz & 5GHz devices ? I would see which band operating devices affected.
I noticed you have set CH11 under Radio 0 statically.  I would prefer to configure it as below so AP can change the channel depend on the environment.
int d0
channel least-congested
HTH
Rasika
**** Pls rate all useful responses ****

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