Cannot auto-connect to wi-fi after sleep

I'm having troubles to reconnect to wi-fi once iPhone 3G goes to sleep mode (once auto-lock is activated when not being used for 1 minute).
This started to happen after 2.1 update.
My son's iPhone 3G which is still running version 2 firmware does not suffer from this.
We have a Belkin wi-fi router in house and when connected the signal strength is full all around the house, but whenever I "wake-up" my iPhone from Sleep mode, it instantly connects to 3G and never auto-connects to wi-fi (even when I'm standing next to the router). It can see and finds the router (under wi-fi settings) but is refusing to connect to it even when I select it.
I have to force this by switching on and off the airplane mode, then it reconnects to wi-fi instantly with full strength.
This useless excercise is so frustrating, especially considering that local provider Telstra is charging $2 per MB for casual use
of data on their 3G network and my iPhone is just happily eating up costly 3G bandwidth when I have a 4 mbits/sec internet connection over home wi-fi network.
Anybody else noticed this after 2.1 upgrade ?
Router is configured for WEP encryption, I've already rebooted my iPhone and the router.
Cheers

I noticed that it takes a few seconds longer to reconnect to wi-fi after sleep, but it has consistently connected.

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