I have calibrated my 4 ESCs from my 3DR kit on several occassions, mostly via the manual method, but they seem to intermitently indicate that they need recalibration.
I turn on the copter and sometimes, all 4 ESCs initialize nominally, but other times some of them continue to beep as if they need calibration. This varies from day to day. I don't understand why they would be in perfect calibration one day and randomly indicated need for calibration on another day.
Additionally, sometime 3 of the ESCs will beep as if needing calibration, but if I'm patient and don't do anything, they will stop beeping one by one and I can go fly. What would cause the beeping to magically stop?