All of the issues with the Castle ESCs might not be their fault. It could be bad components that Castle has no power over and only finds out what's is wrong when the units go bad. Some of the electronic components in these ESCs can be fragile. Vibrations and G forces might be causing problems as well. I had a product made that had issues with the capacitor's lead breaking and caused a few magic smoke
, but it was fixed and Castle will get things fixed. I'll bet that the electronic components manufacturers are cutting corners, I've been in the business for a while to see things happen. I've even sold huge amounts of components that were factory defects without knowing and it's crazy seeing a few thousand TV sets not work because of it.