0717 GMT - Bitcoin declines, reversing last week's rise when it hit an over three-month high of $82,164, as investors become cautious. Uncertainty around the U.S. Federal Reserve rate decision on Sept. 16 is causing traders to take precaution, IG's Chris Beauchamp says in a note. Markets price in a 57% chance of a Fed rate increase this month, LSEG data show. Bitcoin falls 1.2% to last trade at $78,298.