Macbook pro and drop out

My new macbook pro seems to drop wireless connection via the extreme modem; I formerly used my ibook with the same setup and it never happened. Any ideas?
GH

A friend of mine had the same problem with his brand new MBP 15" i5. His MBP 'forgot' the WPA key and couldn't log in to the WiFi network automatically, so he was forced to reconnect manually all the time, very annoying.
I managed at the end to fix his problem, now he has no problems anymore and the MBP is running smoothly since days:
1) delete all entries regarding WiFi security key in Keychain (in Login & System).
2) After that you have to delete all entries in 'Preferred Networks' (Preferences->Network->Advanced).
3) OK & apply all changes
4) Then you can connect to your WiFi network again (don't forget to check 'Remember Networks ...') and this should be it.
I guess that OSX is reacting relatively sensitive regarding WiFi connections, in this case my friend aborted the connection to internet via WiFi during the initial installation of OSX because he was not in his home WiFi network. Therefore I guess that OSX was a bit confused and didn't memorize the WPA2 key properly.

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