Wifi dropping constantly since last update

My wifi has been dropping off every five minutes since last update. My current system version is Mac OS X 10.6.8 (10K549).
Second me if anyone experienced the same problem.
p.s. I've been to the system log.
Here is the latest log on the dropping off.
Mon Oct 17 15:05:58: <configd[13]> _SC_callback: Changed keys = { 'State:/Network/Service/6D1F04B5-545F-4D4A-A5BD-7EB81C15EF4D/DHCP' }
Mon Oct 17 15:05:58: <airportd[296]> _APXMIGwakeupAirPortdServer: received 'SC callback'
Mon Oct 17 15:05:58: <airportd[296]> process_sc_callback: Processing 'State:/Network/Service/6D1F04B5-545F-4D4A-A5BD-7EB81C15EF4D/DHCP'
Mon Oct 17 15:05:58: <airportd[296]> process_dhcp_changes: State:/Network/Service/6D1F04B5-545F-4D4A-A5BD-7EB81C15EF4D/DHCP
Mon Oct 17 15:05:58: <airportd[296]> process_dhcp_changes: DHCP airport_changed = 1
Mon Oct 17 15:05:58: <airportd[296]> setDHCPMessage: dhcpInfoKey "State:/Network/Interface/en1/AirPort/DHCP Message" = (null)
Mon Oct 17 15:06:16: <kernel> IO80211ScanManager::scanDone: Scheduling cache purge timer in 30 seconds.
Mon Oct 17 15:06:16: <configd[13]> _bsd_80211_event_callback: LINK_CHANGED (en1)
Mon Oct 17 15:06:16: <airportd[296]> _APXMIGwakeupAirPortdServer: received 'Driver callback'
Mon Oct 17 15:06:16: <airportd[296]> process_driver_callback: link changed
Mon Oct 17 15:06:16: <configd[13]> _bsd_80211_event_callback: SSID_CHANGED (en1)
Mon Oct 17 15:06:16: <airportd[296]> _APXMIGwakeupAirPortdServer: received 'Driver callback'
Mon Oct 17 15:06:16: <airportd[296]> process_driver_callback: SSID changed
Mon Oct 17 15:06:16: <configd[13]> _bsd_80211_event_callback: BSSID_CHANGED (en1)
Mon Oct 17 15:06:16: <airportd[296]> _APXMIGwakeupAirPortdServer: received 'Driver callback'
Mon Oct 17 15:06:16: <airportd[296]> process_driver_callback: BSSID changed
Mon Oct 17 15:06:16: <configd[13]> _btUpdateCoexMode: <Mac-F2268AC8><MacBookPro5,5> Clamshell state off, Bluetooth Bandwidth Utilization is <0>, LWM <5>, HWM <25>
Mon Oct 17 15:06:16:
Mon Oct 17 15:06:16: <kernel> en1: Received EAPOL packet (length = 135)
Mon Oct 17 15:06:16: <kernel> inputEAPOLFrame: 0 extra bytes present in EAPOL frame.
Mon Oct 17 15:06:16: <kernel> inputEAPOLFrame: Received message 1 of 4
Mon Oct 17 15:06:16: <kernel> FULL RSN IE FOUND:
Mon Oct 17 15:06:16: [00000000] 30 14 01 00 00 0F AC 04 01 00 00 0F AC 04 01 00 00 0F AC 02 00 00
Mon Oct 17 15:06:16: <kernel> storeFullRSNIE: getAP_IE_LIST returned 0
Mon Oct 17 15:06:16: <kernel> PMK:
Mon Oct 17 15:06:16: [00000000] 5C A1 63 99 69 5C ED FC 4F A5 E2 F9 E3 4A 89 F3 B4 92 96 EF F0 59 B5 3E 14 41 0A 5C 29 BA
Mon Oct 17 15:06:16: [0000001E] 06 9D
Mon Oct 17 15:06:16: <kernel> TPTK:
Mon Oct 17 15:06:16: [00000000] 43 B0 AE DA 97 44 08 C2 61 0C B8 87 D2 1F 70 4D 5F 27 B3 69 66 81 94 F0 94 BE 17 5A 32 47
Mon Oct 17 15:06:16: [0000001E] 1D 1B 72 AE 46 51 D0 1B 78 BB E6 10 EF 39 7A 1C A4 AF 30 5C 85 80 5D 9A A2 AC B3 4D E8 E4
Mon Oct 17 15:06:16: [0000003C] 6C 53 15 84
Mon Oct 17 15:06:16: <kernel> KEY MIC:
Mon Oct 17 15:06:16: [00000000] 15 A4 7B F8 BE 64 0E 0F BD 5F 5B D4 6C CB 05 3D
Mon Oct 17 15:06:16: <kernel> process1of4: sending replyPacket 135 bytes
Mon Oct 17 15:06:16: <kernel> en1: Received EAPOL packet (length = 169)
Mon Oct 17 15:06:16: <kernel> inputEAPOLFrame: 0 extra bytes present in EAPOL frame.
Mon Oct 17 15:06:16: <kernel> inputEAPOLFrame: decrypting key data
Mon Oct 17 15:06:16: <kernel> inputEAPOLFrame: Received message 3 of 4
Mon Oct 17 15:06:16: <kernel> process3of4: Performing IE check.
Mon Oct 17 15:06:16: <kernel> process3of4: sending replyPacket ( len = 113 ).
Mon Oct 17 15:06:16: <kernel> process3of4: received pairwise GTK
Mon Oct 17 15:06:16: <kernel> ptkThread: Sleeping!
Mon Oct 17 15:06:16: <kernel> ptkThread: Sleeping!
Mon Oct 17 15:06:16: <kernel> ptkThread: Installing PTK!
Mon Oct 17 15:06:16: <kernel> PTK:
Mon Oct 17 15:06:16: [00000000] 72 AE 46 51 D0 1B 78 BB E6 10 EF 39 7A 1C A4 AF
Mon Oct 17 15:06:16: <kernel> ptkThread: Installing GTK!
Mon Oct 17 15:06:16: <kernel> installGTK: setting cipher key (flags = 0x0)
Mon Oct 17 15:06:16: <kernel> RSC:
Mon Oct 17 15:06:16: [00000000] 00 00 00 00 00 00
Mon Oct 17 15:06:16: <kernel> GTK:
Mon Oct 17 15:06:16: [00000000] 91 79 A7 59 85 4A 61 28 11 A7 96 51 E0 CD F7 1D
Mon Oct 17 15:06:16: <configd[13]> _bsd_80211_event_callback: BSSID_CHANGED (en1)
Mon Oct 17 15:06:16: <airportd[296]> _APXMIGwakeupAirPortdServer: received 'Driver callback'
Mon Oct 17 15:06:16: <airportd[296]> process_driver_callback: BSSID changed
Mon Oct 17 15:06:16: <configd[13]> _btUpdateCoexMode: <Mac-F2268AC8><MacBookPro5,5> Clamshell state off, Bluetooth Bandwidth Utilization is <0>, LWM <5>, HWM <25>
Mon Oct 17 15:06:16:
Mon Oct 17 15:06:16: <configd[13]> _bsd_80211_event_callback: LINK_QUALITY (en1)
Mon Oct 17 15:06:17: <configd[13]> _SC_callback: Changed keys = { 'State:/Network/Service/6D1F04B5-545F-4D4A-A5BD-7EB81C15EF4D/DHCP' }
Mon Oct 17 15:06:17: <airportd[296]> _APXMIGwakeupAirPortdServer: received 'SC callback'
Mon Oct 17 15:06:17: <airportd[296]> process_sc_callback: Processing 'State:/Network/Service/6D1F04B5-545F-4D4A-A5BD-7EB81C15EF4D/DHCP'
Mon Oct 17 15:06:17: <airportd[296]> process_dhcp_changes: State:/Network/Service/6D1F04B5-545F-4D4A-A5BD-7EB81C15EF4D/DHCP
Mon Oct 17 15:06:17: <airportd[296]> process_dhcp_changes: DHCP airport_changed = 1
Mon Oct 17 15:06:17: <airportd[296]> setDHCPMessage: dhcpInfoKey "State:/Network/Interface/en1/AirPort/DHCP Message" = (null)
Mon Oct 17 15:06:18: <configd[13]> _SC_callback: Changed keys = { 'State:/Network/Service/6D1F04B5-545F-4D4A-A5BD-7EB81C15EF4D/DHCP' }
Mon Oct 17 15:06:18: <airportd[296]> _APXMIGwakeupAirPortdServer: received 'SC callback'
Mon Oct 17 15:06:18: <airportd[296]> process_sc_callback: Processing 'State:/Network/Service/6D1F04B5-545F-4D4A-A5BD-7EB81C15EF4D/DHCP'
Mon Oct 17 15:06:18: <airportd[296]> process_dhcp_changes: State:/Network/Service/6D1F04B5-545F-4D4A-A5BD-7EB81C15EF4D/DHCP
Mon Oct 17 15:06:18: <airportd[296]> process_dhcp_changes: DHCP airport_changed = 1
Mon Oct 17 15:06:18: <airportd[296]> setDHCPMessage: dhcpInfoKey "State:/Network/Interface/en1/AirPort/DHCP Message" = (null)
Mon Oct 17 15:06:21: <configd[13]> _bsd_80211_event_callback: LINK_QUALITY (en1)
Mon Oct 17 15:06:26: <configd[13]> _bsd_80211_event_callback: LINK_QUALITY (en1)

It's likely that the update included new definitions or profiles for wifi that your routers are having trouble with. This doesn't indicate that anything is broke, just that iPhones on the newest software are going to have issues with that configuration of wifi. If you have access to your router's settings, try connecting on a different chanel or disabling the security to see if the phone connects that way. http://support.apple.com/kb/HT4199 has some recomended settings, but you may find that changing the name of your network or the security that you are using will fix this issue.

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