Ethernet outdiscards whith PMP430 OFDM

I have some problem with pmp430.
A considerable quantity outdiscards count on the ethernet link on pmp430 steel down.
If click buton “Clear staticstics” when outdiscards < 70 000 count, all is well.
But outdiscards > 70 000 count, thernet link steel down.
Cable is ok, not errors.
What do thet?