I just bought this truck (Redcat Rampage v3) a few weeks back and the driverside rear diff. output cup (part # 50031) keeps on breaking in two inside the diff. where the pin goes through the shaft (and this happens about every 1 to 2 hours of run time). I was needing to know if any one has been having this problem and what to do about it. I am new to 1/5 scale and I would appreciate your assistance. 