Network connection sometines doesn't work (WPA or WEP)

Hi,
My Macbook is sometimes refusing to connect to my wireless network. When the problem occurs, my network is available and listed among all the other available networks. According to tools such as iStumbler, network strength is very good.
Basically, today I start my Macbook and I log in and usually it connects automatically to my default network. Tomorrow it doesn't connect anymore without even coming near to the network settings or even moving the location of my Macbook.
When the problem occurs, I don't have network problems on my iMac (which has identical network settings as my Macbook) or my second laptop (a Windows PC). Tools such as iStumbler show that my network is available and network strength is very good.
When manually forcing it to join the network (I simply select it in the list of all other networks that it detects) I get an error saying that it is unable to connect to the network. Clicking 'Try again' has no affect.
I narrowed the problem down to the security settings. When I'm having this problem and I turn off security on my wireless router (and I also turn it off on the Macbook), my Macbook connects instantly. When I turn security on again (WPA with a passphrase) I am unable to connect. Switching to WEP does not work. (no, it's not me making a typo in the passphrase)
After fiddling with it for a while (usually constantly disabling and enabling my wireless adapter again and again), my Macbook eventually joins the network again.
Yesterday it took me about 40 minutes, a point at which I was about ready to throw it down the stairs.
So I'm using a Philips wireless router and WPA security with a passphrase.
Does anyone have any suggestions?
Kind regards,
Jan

I now discovered that the security settings have no effect on the problem. I don't use any form of security for a while now and everything worked fine for a while. Then the problem occured again, for 2 days.

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