I worked at a RF dealer and we saw some amps come back for repair, but it was because they were mounted upside-down and the heat caused some of the components to fail, so it wasn't their fault. They definitely needed robust power- skimping on the power wire would not work.
If anyone remembers GM's head units 'suddenly' becoming better in '94, it's because GM finally realized how much they were losing to the aftermarket and with RF, located in Tempe, AZ and GM's Desert Proving Ground, located in Mesa, AZ at the time, their proximity was convenient for R&D.