Its been my experience that when you have a connection comprised of a copper wire and an aluminum connector that the connection is more likely to fail as the temperature increases. As the coeffiecient of expansion of aluminum is higher than that of copper. It will expand more as the temp rises and loosens the termination. In electrical power applications this is a major concern since as it heats up it
loosens the connection so it heats up more etc. A cool connection is a good connection.