it sounds like its starting in normal then dropping into sensorless mode
on first throttle application does it rev up hard ?
then when light flashes does power drop off ?
this usually indicates sensor wire/ sensor board issues
try swopping sensor lead then motor
i have had few do this i have "repaired" them by reshimming rotor closer to sensor board
HTH dave fid
oops just re read your post you have carrried out the checks i would do
I have had 6 HW speedos and no failures yet all have been motor / sensor lead related
do you have another ESC to rule out the motors ?
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