Been having the same problem, motor runs for a bit then stops - switch it off and back on again and runs ok for a bit then flashing green light on.
Was told it was possibly battery related (not high enough C rating) and it was pulling the ESC into failsafe mode. I'm using SAVOX 1251 servos in buggy and have now got a power cap installed to try this week.
Disconnecting the sensor lead gives me a red and green flashing light and it goes into sensorless mode - flashing green only is supposed to be overheat protection. Tried the 930 software but have gone back to 211 for this week.
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