McFlurry when the motor starts to go it will loose power. How much power does the tail motor have on a full charge with full right rudder? Also has the sound of the motor changed? If it sounds OK and still has power during full right rudder you may need to turn up the TR trim a bit. I'm not saying it's not your motor, but the 3-in-1 board does creep or at least mine did. I said it before and I'll say it again. Three adjustment pots for the tail is ridiculous.