MM ESC cogging badly

[LiqrSicc]

I bought the thing used from another forum from a guy claiming it was like new. I received it in bad condition. I'm starting to think he sold it to me that way. I just checked the joints and they look good. The on/off switch is missing but im sure that doesnt matter. The power wire is frayed so that might be the problem. Either way I'll pay the $45 or $50 and ship it back to Castle for a new one and just take it as a loss. Thanks for the ideas though!