Imac keeps losing wireless network connection when awoken from sleep mode

I recently did a archive and install on my Imac and I am still trying to get the kinks out.
Since I did the archive and install, my Imac loses it connection to our wireless router. I assume it isn't renewing its DHCP lease. In order to get a connection again, I have to restart my cable modem and my wireless router.
My network settings are set to join preferred networks by default. My default preferred network is listed and the security parameters have been fulfilled. I am set up to use DHCP in Imac preferences.
Any help would be greatly appreciated.
jk

Hi, See if this helps...
Go to System Preferences
Click Network
Highlight AirPort and click Configure...
Choose “By default, join: Preferred networks”
Select your access point.
Remove your access point with the little minus sign. Launch your keychain access in Utilities and delete your access point keychain entry.
Add it in again after a reboot.

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Hi,
I have an Imac 2.8 GHz Intel Core 2 Duo desktop which I have upgraded to lion.
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I am not very computer savy - I.e. I use a computer but don't know programming etc.
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Fri Jan 6 21:25:02 2012
panic(cpu 0 caller 0xffffff80002c266d): Kernel trap at 0xffffff80002936b3, type 14=page fault, registers:
CR0: 0x0000000080010033, CR2: 0x0000000000000020, CR3: 0x000000000f636000, CR4: 0x0000000000000660
RAX: 0x000000000006f9d8, RBX: 0xffffff800445d598, RCX: 0x0000000000000020, RDX: 0x0000000000019fd8
RSP: 0xffffff808073b520, RBP: 0xffffff808073b540, RSI: 0x000000002996b2ee, RDI: 0xffffff8003f83ce8
R8: 0x0000000000000000, R9: 0x0000000000000000, R10: 0xffffff800bf31788, R11: 0x0000000000009268
R12: 0xffffff800374c000, R13: 0xffffff800445d598, R14: 0x000000000006f9d8, R15: 0xffffff8003f83ce8
RFL: 0x0000000000010202, RIP: 0xffffff80002936b3, CS: 0x0000000000000008, SS: 0x0000000000000000
CR2: 0x0000000000000020, Error code: 0x0000000000000000, Faulting CPU: 0x0
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0xffffff808073b1e0 : 0xffffff8000220702
0xffffff808073b260 : 0xffffff80002c266d
0xffffff808073b400 : 0xffffff80002d7a1d
0xffffff808073b420 : 0xffffff80002936b3
0xffffff808073b540 : 0xffffff800029383b
0xffffff808073b560 : 0xffffff800029485b
0xffffff808073b590 : 0xffffff800027e44b
0xffffff808073b5f0 : 0xffffff7f811a44dd
0xffffff808073b630 : 0xffffff7f811a36c4
0xffffff808073b760 : 0xffffff8000328517
0xffffff808073b7b0 : 0xffffff80002e823b
0xffffff808073b8a0 : 0xffffff80003170ce
0xffffff808073b8d0 : 0xffffff80002ec664
0xffffff808073b9e0 : 0xffffff80002f0229
0xffffff808073ba50 : 0xffffff80002f0265
0xffffff808073ba80 : 0xffffff80004e6833
0xffffff808073bb50 : 0xffffff8000316ca3
0xffffff808073bba0 : 0xffffff80005a6e29
0xffffff808073bc30 : 0xffffff8000265675
0xffffff808073bc80 : 0xffffff80002651f3
0xffffff808073bcc0 : 0xffffff800026a62f
0xffffff808073bdc0 : 0xffffff800026cdb4
0xffffff808073bf40 : 0xffffff80002c1f0b
0xffffff808073bfb0 : 0xffffff80002d7941
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BSD process name corresponding to current thread: corestoraged
Boot args: 0x0
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11C74
Kernel version:
Darwin Kernel Version 11.2.0: Tue Aug 9 20:54:00 PDT 2011; root:xnu-1699.24.8~1/RELEASE_X86_64
Kernel UUID: 59275DFA-10C0-30B3-9E26-F7B5DFB1A432
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System uptime in nanoseconds: 46767492658
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com.apple.driver.AppleTyMCEDriver          1.0.2d2
com.apple.driver.AudioAUUC          1.59
com.apple.driver.AppleHDA          2.1.3f7
com.apple.driver.AppleUpstreamUserClient          3.5.9
com.apple.driver.AppleMCCSControl          1.0.26
com.apple.kext.ATIFramebuffer          7.1.2
com.apple.driver.AppleMuxControl          3.0.16
com.apple.driver.AppleBacklight          170.1.9
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.ATIRadeonX2000          7.1.2
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AudioIPCDriver          1.2.1
com.apple.driver.AppleLPC          1.5.3
com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.5d4
com.apple.driver.CoreStorageFsck          182.10
com.apple.driver.AppleIRController          312
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
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com.apple.iokit.SCSITaskUserClient          3.0.1
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com.apple.driver.AppleFWOHCI          4.8.9
com.apple.iokit.AppleYukon2          3.2.2b1
com.apple.driver.AppleUSBHub          4.5.0
com.apple.driver.AppleEFINVRAM          1.5.0
com.apple.driver.AppleRTC          1.4
com.apple.driver.AppleAHCIPort          2.2.0
com.apple.driver.AppleIntelPIIXATA          2.5.1
com.apple.driver.AppleUSBEHCI          4.5.0
com.apple.driver.AirPortBrcm43224          500.36.11
com.apple.driver.AppleUSBUHCI          4.4.5
com.apple.driver.AppleHPET          1.6
com.apple.driver.AppleACPIButtons          1.4
com.apple.driver.AppleSMBIOS          1.7
com.apple.driver.AppleACPIEC          1.4
com.apple.driver.AppleAPIC          1.5
com.apple.driver.AppleIntelCPUPowerManagementClient          167.0.0
com.apple.nke.applicationfirewall          3.2.30
com.apple.security.quarantine          1
com.apple.driver.AppleIntelCPUPowerManagement          167.0.0
com.apple.driver.AppleAVBAudio          1.0.0d11
com.apple.driver.AppleHDAHardwareConfigDriver          2.1.3f7
com.apple.driver.DspFuncLib          2.1.3f7
com.apple.driver.AppleBacklightExpert          1.0.3
com.apple.iokit.IOSurface          80.0
com.apple.iokit.IOFireWireIP          2.2.4
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.AppleHDAController          2.1.3f7
com.apple.iokit.IOHDAFamily          2.1.3f7
com.apple.iokit.IOBluetoothSerialManager          4.0.1f4
com.apple.iokit.IOSerialFamily          10.0.5
com.apple.iokit.IOAVBFamily          1.0.0d22
com.apple.iokit.IOEthernetAVBController          1.0.0d5
com.apple.iokit.IOAudioFamily          1.8.3fc11
com.apple.kext.OSvKernDSPLib          1.3
com.apple.driver.ApplePolicyControl          3.0.16
com.apple.driver.AppleGraphicsControl          3.0.16
com.apple.iokit.IONDRVSupport          2.3.2
com.apple.kext.ATI2600Controller          7.1.2
com.apple.kext.ATISupport          7.1.2
com.apple.iokit.IOGraphicsFamily          2.3.2
com.apple.driver.AppleSMC          3.1.1d8
com.apple.driver.IOPlatformPluginFamily          4.7.5d4
com.apple.driver.AppleFileSystemDriver          13
com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.1f4
com.apple.driver.AppleUSBBluetoothHCIController          4.0.1f4
com.apple.iokit.IOBluetoothFamily          4.0.1f4
com.apple.driver.CoreStorage          182.10
com.apple.iokit.IOUSBHIDDriver          4.4.5
com.apple.iokit.IOSCSIBlockCommandsDevice          3.0.1
com.apple.iokit.IOUSBMassStorageClass          3.0.0
com.apple.driver.AppleUSBMergeNub          4.5.3
com.apple.driver.AppleUSBComposite          3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.0.1
com.apple.iokit.IOBDStorageFamily          1.6
com.apple.iokit.IODVDStorageFamily          1.7
com.apple.iokit.IOCDStorageFamily          1.7
com.apple.driver.XsanFilter          403
com.apple.iokit.IOATAPIProtocolTransport          3.0.0
com.apple.iokit.IOSCSIArchitectureModelFamily          3.0.1
com.apple.iokit.IOFireWireFamily          4.4.5
com.apple.iokit.IOUSBUserClient          4.5.3
com.apple.iokit.IOAHCIFamily          2.0.7
com.apple.iokit.IOATAFamily          2.5.1
com.apple.iokit.IO80211Family          411.1
com.apple.iokit.IONetworkingFamily          2.0
com.apple.iokit.IOUSBFamily          4.5.3
com.apple.driver.AppleEFIRuntime          1.5.0
com.apple.iokit.IOHIDFamily          1.7.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          165.3
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          331
com.apple.iokit.IOStorageFamily          1.7
com.apple.driver.AppleKeyStore          28.18
com.apple.driver.AppleACPIPlatform          1.4
com.apple.iokit.IOPCIFamily          2.6.7
com.apple.iokit.IOACPIFamily          1.4
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Would anyone be able to help please???
Thank you very much !!
Dave

Hi, for other peoples information - I finally figured out the problem. It was actually a faulty RAM module which I had bought. I had upgraded from 2 to 4 gb of RAM using an approved type of RAM for my particular computer. Finally I removed one module of RAM (after doing nearly everything else under the sun including trying to reinstall the operating system and wipe the computer etc) and the computer worked fine.
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Imac keeps losing wireless network connection when awoken from sleep mode

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