Another ESC problem!

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Any advice appreciated

ESC = Speed Passion GT 1.1

Motor = Various brushless

Last time I raced the motor/ESC started to act up. It seemed like a 'dead spot' in the motor. I'd spin up the motor go back to neutral then try again nothing. If I manually advanced the motor then moved the throttle no problem! There seemed to be a certain spot that if the motor stopped at this point it would not go again until it was moved manually then off it would go.

I've just been messing about with the ESC on the bench. Re-done all the wiring, checked all the connections etc.

Without the sensor wire attached the motor spins fine, no 'dead spots' everything seems fine.

When I attach the sensor wire the problem is back? I've also changed the sensor wire but the problem is still there!

Any suggestions?