IMac and Mac Book Pro will not stay connected to WiFi on TC

Hi,
I'm a new Mac owner, and I changed completely over to Apple over the weekend.  Have na iMac and Mac Book Pro with a 2 TB Time Capsule.  Hooked everythng up and all seems to be working, except everytime my computers go into sleep mode when I wake them up they ask me to select my wireless network again because I lost connection.  Once I select my network it works fine until the computer goes to sleep.  WhenI wake it up, it asks me again.  I have it set to automatically connect to known networks, but it doesn't.  I have to click on it everytime I wake up the computer.  Before I hooked up the TC, I was using my old wireless router and it stayed connected.  Now that I put the TC in as my wireless neteork it asks me to select my network.  Is there something I'm not doing that may help the iMac and Mac Book Pro stay connected?
Thanks. 

For that particular WiFi update, yes - it means you can't download it. However, that update may have been included already in M-L 10.8 ...
I feel your pain regarding these anomalies - I had the same problems on my year-old iMac that I just exchanged with Apple for a new one - I had worked these software/network issues on the old one for over five months, and finally, I demanded a new system as a replacement. Just too many problems. For me, Update 10.7.3 for Lion was the cause of my network problems. The WiFi update/patch solved the sleep issue for me, but not the auto-connect problem for system start-up's and restart's. After system start-up's and restart's, I would have to manually select my router address to connect via WiFi. But after manually selecting the address, the WiFi connection would stay-on - it wouldn't drop-off.
Again, with this replacement iMac, I don't even trust its WiFi capability - and with a desktop, why should I ? I simply purchased a Cat-6 Ethernet cable, and wired it into my Time Capsule ... To heck with WiFi ! ... Remember: don't download ANY system updates wirelessly ! Don't do it. ... Apple will rue the day they did away with Ethernet connectors on their computers ... - The same goes for CD-based software, or at least some other "physical" means for software installation ...
But, as for future system updates, and how they affect this new iMac ? - If they screw it up, I'm not messing with it ! - Apple's getting it back, the next day ! I'm not going to go through five months of testing, repairs, forced new purchases, etc. etc. ever again ...

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