Generally Packet "ERRORS" Not discards or packet loss. Means, faulty hardware.
Try updating your NIC drive. What Distro and Kernal version are you running?
Also what model is the NIC card?
It could also be errors, from the device you are connecting. Not necessarily your PC..
Switch, router, etc..
I would use a "Premade" cable first to test. Not one you crimped.. See if you still get errors.