combat consistency

Hey guys. absolutely love this. been talking with a friend about trying to make exactly what your doing for so long. when its going smooth. its incredible. you can see all the potential on how good its going to be. Ive noticed a few times now. first couple of combat encounters run smooth. organised. understands everything. tracks movement and damage well. but then all of asudden it stops tracking damage dealt. and just starts one hit killing or getting things wrong and ends encounters in one turn. is there a way to keep on top of this, resetting it somehow to following the combat isntrutions properly again?