Problems with networking after sleep since March 1st EPI firmware update

Hi,
After the new EPI firmware upgrade of my macbook pro (4 months old) a problem that I had 3 months ago re-appeared again :
when I received my laptop (Lion, fully updated) a few months ago it had problems getting internet access after waking from sleep : it could detect the wifi-network, it was connected and when I tried to ping -for example- google.com in terminal it would answer. This means my network was working and DNS was working too...
Only when opening safari, or software update or any other program that wants to go online, it would give me a 'no internet connection' message. After 3 minutes or so, it would work again (wihtout doing anything). I tried renewing the DHCP lease, moving the order of interfaces, re-adding the networks after deleting but nothing helped.
The problem back then was solved after a firmware upgrade, and it would be online 2 sec after waking from sleep.
After this week's firmware upgrade the problem came back......
Anyone have any suggestions, or anybody know if Apple is working on it again?
Thanks,
Koen

For me the problem is solved now.....last night software upgrade popped up with "another" EFI-firmware upgrade, and after this it worked again....too bad I didn't look at version number. But I'm happy I wasn't the only one with this problem....
For the questions above : this was abviously firmware related since it happened directly after the first update. If something has worked and nothing changed in the peripherals the problem is in hte thing that DID change...the firmware. I was surfing after solutions and I did see that there is a problem for some people with the way the OS passes on the DNS (so when pinging, the DNS is picked up directly or something, but in applications such as safari.... it grabs the settings from the OS somewhere). There was a terminal-based solution to reset this setting but by the time I wanted to try it the frimware upgrade popped up....but maybe it can help others...

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