It's difficult to say without having it to hand, my initial guess would be that the nut is stripped, it could appear fine unassembled and finger tight but under load be skipping the threads.
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----Cougar 2 team----Cougar 2 works----Cougar 2000---- ----Schumacher Bosscat---- ----Traxxas TRX1----Losi XXX CR----Losi XXX BK2---- ----AE B4 ft----Xfactory X6^----DEX210 V1---- ----TLR22 3.0----TLR22 4.0----TLR22t 4.0----TLR22 5.0AC---- ----AE B6.4----
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