Originally Posted by carryyourbooks
when your wires get hotter, that extra heat can be transferred to the filament and shorten the life of your bulbs.
Wires that are running over temperature transfer less power than cold ones. Less power means lower voltage at the filaments, which would make them run colder. The very reason voltage drops is because it's being made into heat. At the end of the cord, less voltage would mean less power, and a colder filament.
On the other hand, there's no telling what kind of electronics are in that Power Bar. Since there was no trouble before and there is trouble after, removing it would be a good first move. I bet a buck it says "made in China'' on it somewhere.