Hi Brendan,
thank you for your fast reply. Yes, the servo has always been used with this setup and it's a new problem that occurs with both radios. The ESC is a LRP 7.1 digital, you can find the spec here
It's a good ESC as Mamba. I don't understand why the servo works fine with the Hitec HFP-10 Digital Servo Programmer. Any suggestion?
Alex