WPA connection loses packets - please help!

Hi All!

I have a problem with the wireless segment of my network, which consists of
a Linksys BEFW11S4 V4 (firmware 1.50.10) wireless router, and a Intel Pro
Wireless 2100 3A card (driver ver. 1.2.0.56) in a centrino combo (dell
inspiron 8600).

My problem is that when i connect using WPA-PSK, the connection loses
packets every few seconds.
I use the dell-installed intel PROset utility (v. 7.1.1), and i have stopped
the WZC service form running (since this caused me getting booted of the
network every 5 mins.

When i continuously ping the router, around 6-8% of the packages gets no
reply (every 5. - 15. package). All the others return fine.
This problem occurs no matter if I'm 3 feet away, or 30 feet through big
walls.
I have tried all different channels on the router.

The connection works flawlessly with any kind of WEP encryption, and
likewise without any security, which makes me believe that it's not an
interference problem and i haven't got a cordless phone or anything like
that).

What am I missing here?
Please help me, because this i driving me mad

Sincerely, and thanks in advance...
Beack




Here's a snip from the windows ping utility (it's in danish, but you get the
point):

Anmodning fik timeout.
Svar fra 192.168.1.1: byte=32 tid=11ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=4ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=7ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=7ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=6ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=6ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=6ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=7ms TTL=150
Anmodning fik timeout.
Svar fra 192.168.1.1: byte=32 tid=11ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=7ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=6ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=7ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=8ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=8ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=3ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=7ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=8ms TTL=150
Anmodning fik timeout.
Svar fra 192.168.1.1: byte=32 tid=11ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=4ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=7ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=7ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=7ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=7ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=6ms TTL=150
Svar fra 192.168.1.1: byte=32 tid=7ms TTL=150
Anmodning fik timeout.







I8600:

Cpu: PM 1.4 GHz
Ram: 768 MB
Graphics: 128 MB Ati Radeon 9600
Display: SXGA+ (Samsung)
Disk: 30 Gigs 4200 rpm (soon to be replaced with a Hitachi 7K60)
Wireless: Intel Pro/Wireless 2100 3A