He stopped streaming and doing a lot of media stuff and just started taking playing dota a lot more seriously . I miss solo streams personally . <| sep |> Is it a brushless motor system or a brushed DC system ? If its a brushless system it does sound like it could be a bad connection on one the outputs of the ESC . Brushless motors are three phases and have three wires from the ESC to the motor . In theory if one of the connections is lose the motor will still spin but not very efficiently . The way the motors are wired they are designed to get pulses at different phases . Kind of like if you had a three cylinder engine and one of the cylinders is offline . It could very well be a bad solder joint as well as you alluded to . Which could be why it will at least start up . It may have enough connection to make system think its online . You may want to look at the ESC and see if it has what is known as a cold solder joint .