Picture? Generally speaking, I would keep a very close watch and monitor it aggressively. If you notice the STN is progressing, you may want to consider fragging. I would personally only frag it as a last resort. Are you 100% positive the temp is what did it? How much of a temp swing was it? You want to confirm it was absolutely the temp and not something else you might have over looked that is causing the STN; otherwise you're assuming the threat/cause has been corrected when in reality it may not have been.