Due to a problem in the Intel® Quartus® Prime Pro Edition Software version 22.3 and earlier, you might see itx_underflow asserted in an F-Tile Interlaken Intel® FPGA IP single-segment design. It will cause the Physical Medium Attachment (PMA) to lose lock.
There is no workaround for this problem. When the error occurs, you need to reset both the F-Tile Interlaken Intel® FPGA IP and the transceiver to re-establish the link.
This problem is scheduled to be fixed in a future release of the Intel® Quartus® Prime Pro Edition Software.