d-link dwl-g510 - lots of TX packet errors

[root@linuxkiste ~]# ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2250 errors:0 dropped:0 overruns:0 frame:0
TX packets:2250 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:203988 (199.2 KiB) TX bytes:203988 (199.2 KiB)

ra0 Link encap:Ethernet HWaddr 00:13:46:8A7:B7
inet addr:192.168.0.171 Bcast:192.168.0.255
Mask:255.255.255.0
inet6 addr: fe80::213:46ff:fe8a:d7b7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9500939 errors:0 dropped:0 overruns:0 frame:0
TX packets:9676224 errors:8730 dropped:8730 overruns:0
carrier:0
^^^^^^^^^
collisions:1344756 txqueuelen:1000
RX bytes:248915086 (237.3 MiB) TX bytes:636258362 (606.7
MiB)
Interrupt:12

The amount of errors increases dramaticaly when connecting with another
client at the same time. Wireless-Router is also from D-Link.

Any Ideas !? Or is this behaviour normal?

Greets
....

if you have similar problems just move the client as near as possible
to the access point.

This solved mine. No TX packet drops anymore.

....