This read-only integer, with no source description provided beyond its name, is a per-group counter tracking frames or blocks that arrived out of their expected sequence for this group. An administrator would treat a rising count as evidence of reordering or loss affecting traffic aggregated across this group's member links. For example, a group combining several PVCs that shows a climbing statGrpOutOfSeqErrs count would lead the administrator to suspect one of the member links is delivering data with inconsistent latency, causing frames to arrive out of order.