Incomplete Combo or "other move" while combo.
This issue is back again on Apple iPhones. Doing a standard combo (MLLLM) and about the 2nd or 3rd light, my character just stands there. Or during same combo (different instance), around the same 2nd or 3rd light, my character will evade, block or heavy (very fast heavy, like only I've seen defender pull off). I was using Aegon on 30min event quest fights.