Cheers guys,
now seriously, I almost got mad, but let me explain the scenario before
I do so:
I've got a laptop (XP, SP2) with a PCMCIA wireless card, namely the
Netgear WG511 from Netgear which is supposed to connect to an AP
(Netgear WG602) that is connected to our local network in our house.
FYI: Both the card and AP are the first versions, ergo v1 (as they say
on their website).
Well, I've used this setup for as long as I've owned the hardware and
it worked like a charm, but just without any encryption no security at
all, yay

I've recently discovered that our neighbours also started to go the
wireless way (3 different SSIDs on our property...), so my idea was and
still is to encrypt my connection via WEP. So far so good, the lazyness
was beaten.
I'm not 'too' dumb with computers, so I've set up everything - and it
worked.
The laptop connected to the AP, got its IP via DHCP from another server
in our lan and Mr Laptop was online.
But, why does this only last for a random number of hours?!?
I've tried everything, 64bit, 128bit encryption, dhcp on/off, whatever,
even reboots on the laptop didn't affect anything...It always WORKS,
for God's sake, but just some hours, then I cannot reconnect to the AP.
The network's SSID is recognized but it always gets stuck at
initializing the IP for the wifi interface, either via DHCP or static
address, same phenomenon.
Funny fact of the day: It works again when I restart (unplug & replug
AC) the Access Point, it's even working now.
I've tried different firmware versions for the WG602 (current version
is 1.7.16) and driver versions for the WG511 (currently 3.0), I have
tried both the supplied Netgear config tool and Windows config options.
So I've come to the point to almost give up, just tell the access point
to do some access control via MAC address, but I do not think that this
is the best thing since sliced bread...
Any help with this? At first I thought it's got to do with ASCII/Hex
transfer problems, but this cannot be the case. (Did I say that it
actually IS working?

)
Thanks in advance for having read that far