After receiving an email from Audio Advisor asking me how satisfied I've been with my purchases from them, I responded explaining the collapse of the Pangea Mega Feet.

I received a response I never expected: they hadn't experienced this problem before, and discussed the matter with the folks at Pangea and felt it may be a result of my amp getting too hot (it does get very hot) for them to function properly.

As a result, even though I didn't request it, they are refunding my money! That's good business, and I commend them.