I just checked the FS...now i gonna try...
...checking ram...hmm...the ram should be ok...but next time i restart i can check it, too...
EDIT: Hmmm...now i have another time the problem with amount of uploaded data...i see 210 MB, but i uploaded 400 KB...

I think there's something in the system...
EDIT2: ifconfig output, if it helps...
eth0 Link encap:Ethernet HWaddr 00:17:31:8d:65:fc
inet addr:192.168.0.15 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::217:31ff:fe8d:65fc/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:6039078 errors:0 dropped:0 overruns:0 frame:0
TX packets:4607550 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1720526637 (1.7 GB) TX bytes:3006893310 (3.0 GB)
Interrupt:19
But all other traffic works without an error....also FTP transfers.,..