Hi, I am a newbie here. I recently bought a P4, and have been flying a few times with it last couple of weeks. After a week of inactivity however, since yesterday, I now get beeps (about 1Hz) from the Go app as soon as I start the motors spinning, in P-mode. I do get enough GPS sattelites though, and the compass is calibrated too.These beeps remain until I take off. Is this normal? I don't recall having these beeps before. I upgraded to the latest firmware, recalibrated the compass, looked for warnings in the Go app... read the manual once more... nothing... I cannot find anything mentioned about this. Once I take off, the beeps disappear and the phantom flies perfectly normal. Anyone else having this?