There was an identical story in my family as well.

The way around it is simple enough, don't overfill it, and check on it every so often that the pressure relief is
JUST releasing, and not rattling around like a banshee.
Good luck to those willing to give them a try, they can cut the cooking time for some awesome meals down by 75%,
I'll take a pic next time of the results, and post the time taken.