This counter tracks frames that were incorrectly transferred -- specifically frames that arrived too small -- from the Rx FPGA. This is a hardware data-path symptom internal to the receiver's FPGA-to-memory transfer, distinct from RF-layer or protocol-layer errors, so a rising count here without corresponding degradation in Eb/No points toward an internal hardware fault in the receive chain rather than the satellite signal. A technician seeing this counter climb on an otherwise RF-healthy link would consider it grounds for suspecting a hardware fault in the Rx FPGA or its memory interface and potentially requesting a unit swap.