Wow .. scary stuff! I have one plane set up with a 2018, 2X7008 RX and no gyros, and one with 2x7008s into an iGyro feeding, then going to both inputs of a 2018 just like yours. I felt it was a pretty good redundant setup. Hmm...

Any factors on your iGyro that might have accelerated corrosion? Did it spend a lot of time near salt water? Sit in a damp basement for a long time? Being in the electronics business, I know that corrosion problems are quite common if the electronic assembly is not done to a high standard. I have always seen the Powerbox guys as a class act in both HW and SW but perhaps they did not anticipate these issues .. as suggested by the prior posts, is there some hint of why that could be discovered?

Dave