Network cable changed, used 100 mbps connections. I do not think that the problem is in the cable.
Tomorrow re-check the cable.
=========================================================================== ping -n 1000 -l 35000 bytes
80% loss, lost packets 808 ping -n 1000 -l 30000 bytes
1% loss, lost packets 18
The compound of WiFi. ping -n 1000 -l 65000 bytes
0% loss, lost packets 0