slip away, slip by, sink, go by, elapse, oversight, backsliding, pass, fall back, go along, more...

continue, persist, remain, endure

memory lapse, slip of the tongue, Freudian slip, more...

long, momentary, mere, considerable, moral, temporary, certain, occasional, short, serious, brief

moment of weakness,   missing moment,   fall into silence,   a memory forgotten,   momentary slip,   weak moment