about Back to back packets lost in MAC + DMA

Dear muscleman: Would you like to tell me if the problem of “Back to back packets lost in MAC + DMA” found by Mr. Nkfelectronics is due to NET+50 itself. Is there any method to solve this problem? I am planning to do an Ethernet application using NET+50 and I have purchased Nucleux Ethernet Driver Module for NET+50? Help!!!