Wifi unavailable upon wakeup

When my iMac 27 mid-2011 10.7.1 wakes up from sleep, an alert window immediately appears, telling me that no WiFi network is available.
In fact, my WiFi connection will always establish itself a mere 2 seconds later.
But even then, the alert window will remain on screen until manually dismissed.
I was wondering if there was a setting somewhere that could delay the triggering of this "WiFi Unavailability" alert window.
A delay that would allow the reconnection to establish itself and thus prevent this bothering alert from appearing.
Thanks in advance.
YM

I am also experiencing this, but on a 2011 MacBook Pro.

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My iBook has started to crash sometimes when I wake it up from sleep mode. I have now idea why, it happens randomly but only when it wakes up.
What happens is the screen goes grey and a black box tells my to restart my computer i four different languages.
I have viewed the crash report but have no idea what it means. So I will also post it here, if somebody knows what it all means:
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x000000002351351A PC=0x00000000002FE038
Latest crash info for cpu 0:
Exception state (sv=0x2E292280)
PC=0x002FE038; MSR=0x00009030; DAR=0x2351351A; DSISR=0x40000000; LR=0x002FE0C4; R1=0x17793C20; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002FE0C4 0x002FF84C 0x002B6494 0x002EA2C8 0x0008B364 0x0002921C
0x000233F8 0x000ABAAC 0x65685874
Proceeding back via exception chain:
Exception state (sv=0x2E292280)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x2D702000)
PC=0x9000AB48; MSR=0x0200F030; DAR=0xE00F5000; DSISR=0x42000000; LR=0x9000AA9C; R1=0xBFFFC690; XCP=0x00000030 (0xC00 - System call)
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Darwin Kernel Version 8.8.0: Fri Sep 8 17:18:57 PDT 2006; root:xnu-792.12.6.obj~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
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Backtrace:
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Proceeding back via exception chain:
Exception state (sv=0x2E292280)
PC=0x002FE038; MSR=0x00009030; DAR=0x2351351A; DSISR=0x40000000; LR=0x002FE0C4; R1=0x17793C20; XCP=0x0000000C (0x300 - Data access)
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0x002FE0C4 0x002FF84C 0x002B6494 0x002EA2C8 0x0008B364 0x0002921C
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Exception state (sv=0x2D702000)
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Darwin Kernel Version 8.8.0: Fri Sep 8 17:18:57 PDT 2006; root:xnu-792.12.6.obj~1/RELEASE_PPCModel: PowerBook6,7, BootROM 4.9.3f0, 1 processors, PowerPC G4 (1.5), 1.33 GHz, 1 GB
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Modem: Jump, , V.92, Version 1.0,
Bluetooth: Version 1.7.8f2, 2 service, 0 devices, 1 incoming serial ports
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USB Device: Bluetooth HCI, , Up to 12 Mb/sec, 500 mA
USB Device: Apple Internal Trackpad, Apple Computer, Up to 12 Mb/sec, 500 mA
iBook 12" G4 Mac OS X (10.4.8) 60Gb HD, 1Gb RAM
I hope you can give me som help here.
Nikolaj

The symptom you describe is called a "Kernel Panic."
[ Resolving Kernel Panics ]
Procedures to troubleshoot the exact cause of this situation are
outlined in the above link, and there also is a link back to Apple's
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Related to the main probable cause(s) of a kernel panic, from
[ Problems from Insufficient RAM and free hard drive space ]
(The user-added 512MB RAM chip may be cause of the panic.)
Best of outcomes; I've done this before.

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www.hp.com/contacthp/
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Wifi unavailable upon wakeup

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