Don't know what you people are doing to your castle stuff. The OP here was just unlucky. I hear about more Tekin RX8 failures than MMM.

I'm not a fanboy, but I have a lot of Castle stuff, including an MMM combo like the OP's, they are all being run at their limits (3S/6S etc with tall gearing), and have never even given me so much as a hiccup.

Learn to gear? /shrug