Lately when I trim and wiggle video events about in small ways I see strangely wrong consequences of these "corrections". Within the events there appear random places of short dissolves or a few frames in a row become out of focus. I never had this happen to me before so it must be something I have caused by pushing a setting without realizing such. Can anyone tell what I have wrought? To me this perhaps indicates I am inadvertently making changes in velocity when I think I am just creating holds of the last frame in gentle increments. Where should I look to correct this if this is the case?