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DP83848J: Link status lost on transmit of data

Part Number: DP83848J

Dear TI. I am using the ARTY A7 100T baord with your PHY on it.

The PHY's Basic Mode Status Register and PHY Status Register shows the correct link status. I can plug and unplug my cable and it shows accordingly. But I noticed that when ever I send a packet over my MAC, the registers indicate that the link is disconnected. It quickly shows the connected state again. 

PHY Up
Tx 42 bytes
PHY Down
PHY Up
Tx 42 bytes
PHY Down
PHY Up

Is this normal, or is there something I might have done wrong? I enable auto negotiation for all duplex and speed options.

Regards,

Riaan Oosthuizen