HWIC-AP-AG-A keep on disconnecting wireless clients sometime its ok but sometimes its not

Question

hi,
i have a  HWIC-AP-AG-A running in 2801 router.
RTR01(config-if)#do sho run int Dot11Radio0/1/0
Building configuration...
Current configuration : 367 bytes
interface Dot11Radio0/1/0
no ip address
no dot11 extension aironet
encryption vlan 30 mode ciphers tkip
encryption vlan 40 mode ciphers tkip
encryption vlan 10 mode ciphers tkip
ssid GuestUsers
ssid InternalUsers
ssid SecureZone
speed basic-6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0
channel 2412
station-role root
no cdp enable
end
RTR01(config-if)#do sho run int Dot11Radio0/1/1
Building configuration...
Current configuration : 325 bytes
interface Dot11Radio0/1/1
no ip address
encryption vlan 30 mode ciphers tkip
encryption vlan 40 mode ciphers tkip
encryption vlan 10 mode ciphers tkip
ssid GuestUsers
ssid InternalUsers
ssid SecureZone
speed basic-6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0
station-role root
no cdp enable
there are days that the wireless signal is keep on disconnecting.. im no sure what is the problem or.. what can i do?
n Interface FastEthernet0/3/0, changed state to up
*Jan 12 11:00:25.511: %LINK-3-UPDOWN: Interface BVI30, changed state to down
*Jan 12 11:00:25.511: %LINK-3-UPDOWN: Interface BVI40, changed state to down
*Jan 12 11:00:26.535: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI30, changed state to down
*Jan 12 11:00:26.535: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI40, changed state to down
*Jan 12 11:00:27.679: %DSPRM-5-UPDOWN: DSP 1 in slot 0, changed state to up
*Jan 12 11:00:28.091: %LINK-3-UPDOWN: Interface Foreign Exchange Office 0/0/0, changed state to up
*Jan 12 11:00:28.503: %LINK-3-UPDOWN: Interface Foreign Exchange Office 0/0/1, changed state to up
*Jan 12 11:00:28.735: %LINK-3-UPDOWN: Interface Foreign Exchange Station 0/2/1, changed state to up
*Jan 12 11:00:28.843: %LINK-3-UPDOWN: Interface Foreign Exchange Station 0/2/0, changed state to up
*Jan 12 11:00:31.563: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel1, changed state to up
*Jan 12 11:00:32.290: %DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/0 assigned DHCP address 222.164.193.47, mask 255.255.252.0, hostname marlonmalinao.homeip.net
*Jan 12 11:00:33.582: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel100, changed state to up
*Jan 12 11:00:42.381: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 123: Neighbor 10.10.254.1 (Tunnel1) is up: new adjacency
*Jan 12 11:00:44.773: %SSH-5-SSH2_SESSION: SSH2 Session request from 172.25.254.4 (tty = 0) using crypto cipher 'aes256-cbc', hmac 'hmac-sha1' Succeeded
*Jan 12 11:00:56.652: %SSH-5-SSH2_USERAUTH: User 'mc.malinao' authentication for SSH2 Session from 172.25.254.4 (tty = 0) using crypto cipher 'aes256-cbc', hmac 'hmac-sha1' Succeeded
*Jan 12 11:00:57.948: %DOT11-6-FREQ_USED: Interface Dot11Radio0/1/1, frequency 5320 selected
*Jan 12 11:00:57.952: %LINK-3-UPDOWN: Interface Dot11Radio0/1/1, changed state to up
*Jan 12 11:00:59.076: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0/1/1, changed state to up
*Jan 12 11:01:00.172: %LINK-3-UPDOWN: Interface BVI30, changed state to up
*Jan 12 11:01:01.171: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI30, changed state to up
*Jan 12 11:01:05.499: %LINK-3-UPDOWN: Interface BVI40, changed state to up
*Jan 12 11:01:06.499: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI40, changed state to up
*Jan 12 11:01:13.202: %IPPHONE-6-REG_ALARM: 14: Name=SEP001E4AF3B6D4 Load= SCCP70.8-4-2S Last=UCM-closed-TCP
*Jan 12 11:01:13.206: %IPPHONE-6-REGISTER: ephone-6:SEP001E4AF3B6D4 IP:172.25.254.61 Socket:1 DeviceType:Phone has registered.
*Jan 12 11:01:25.401: %DOT11-6-ASSOC: Interface Dot11Radio0/1/1, Station   8c7b.9dde.e8f9 Associated SSID[InternalUsers] AUTH_TYPE[OPEN] KEY_MGMT[WPA PSK]
*Jan 12 11:01:37.236: %DOT11-6-ASSOC: Interface Dot11Radio0/1/1, Station MCMRTR01 0019.d2b8.3c68 Associated SSID[GuestUsers] AUTH_TYPE[OPEN] KEY_MGMT[WPA PSK]
*Jan 12 11:03:15.542: %DOT11-6-DISASSOC: Interface Dot11Radio0/1/1, Deauthenticating Station 0013.e8a2.a4c1 Reason: Sending station has left the BSS SSID[InternalUsers]
*Jan 12 11:03:43.247: %LINK-3-UPDOWN: Interface Dot11Radio0/1/0, changed state to up
*Jan 12 11:03:44.247: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0/1/0, changed state to up
*Jan 12 11:07:20.957: %DOT11-7-AUTH_FAILED: Station 0013.e8a2.a4c1 Authentication failed
*Jan 12 11:07:32.720: %DOT11-6-ASSOC: Interface Dot11Radio0/1/1, Station MCMX61 0013.e8a2.a4c1 Associated SSID[GuestUsers] AUTH_TYPE[OPEN] KEY_MGMT[WPA PSK]
*Jan 12 11:08:16.023: %DOT11-6-DISASSOC: Interface Dot11Radio0/1/1, Deauthenticating Station 8c7b.9dde.e8f9 Reason: Previous authentication no longer valid SSID[InternalUsers]
*Jan 12 11:08:16.343: %DOT11-6-ASSOC: Interface Dot11Radio0/1/1, Station   8c7b.9dde.e8f9 Associated SSID[InternalUsers] AUTH_TYPE[OPEN] KEY_MGMT[WPA PSK]
*Jan 12 11:09:21.208: %DOT11-4-MAXRETRIES: Packet to client 8c7b.9dde.e8f9 reached max retries, removing the client
*Jan 12 11:09:21.208: %DOT11-6-DISASSOC: Interface Dot11Radio0/1/1, Deauthenticating Station 8c7b.9dde.e8f9 Reason: Previous authentication no longer valid SSID[InternalUsers]

Answer 1

Your wireless clients will associate to the best AP interms of signal strenght and signal to noise etc.
There is an LWAPP tunnel between the access point and the controller.
At the controller there will be logical interfaces for the wireless LANS that are asssociated to specific VLANs on the wired network.
It doesn't matter where you are in the building as a client as its the controller that puts the client data onto the wired network.
All client data is tunneled between the access point and the controller.
With regard to the losing IP address situation. I assume that the clients do initially get an IP address and then lose it after a period of time.
Check the session timeout paramter on the controller (look on the WLAN-Advanced).
There is a bug with some versions of software relating to session timeouts. Try setting the timeout to 65535 seconds. The default setting is probably 30 minutes.