LwIP: Ethernet Interrupt stops working after a while

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@XuanTran, intuitively it makes me think of an unhandled error condition. Something went wrong and the peripheral is waiting for an acknowledgment from the application.
I am familiar with the Zynq 7000 network, although I only use FreeRTOS-Plus-TCP.
I used both 100 Mb and 1 Gb without problems.

In the FreeRTOS+TCP Xylinx driver, 3 interrupts are being used: send, receive, and error:

	XEmacPs_SetHandler( &xemacpsif->emacps, XEMACPS_HANDLER_DMASEND,
						( void * ) emacps_send_handler,
						( void * ) xemacpsif );

	XEmacPs_SetHandler( &xemacpsif->emacps, XEMACPS_HANDLER_DMARECV,
						( void * ) emacps_recv_handler,
						( void * ) xemacpsif );

	XEmacPs_SetHandler( &xemacpsif->emacps, XEMACPS_HANDLER_ERROR,
						( void * ) emacps_error_handler,
						( void * ) xemacpsif );

Can you put a break in you emacps error handler? Or set some variable to remember what events have occurred?