I'm a bit puzzled. I have a 20ah 48v with built in BMS (chinese sun-thing). And a cheap 1000w (allegedly) rear hub motor. The bike will happily pull full throttle up a hill and reach full speed etc. but will sometimes cut out straight away or mid ride and not turn on again without disconnecting/reconnecting the battery. This makes me believe it's the bms shutting the battery down. but for what reason? It happens most often when I throttle down and coast down hill going fast and then try to bring the throttle back in, which i would assume isn't a high load scenario. It also just happens randomly too. Dodgy bms?? dodgy throttle? dodgy anything else? how hard is it to replace a bms?? Any advice would be really appreciated as it's so much fun but i don't want to ride it until i know what's going on...