Learnt another thing today. Have recently velcroed a GPS tracker beneath the battery compartment. Soon after take off I lost FPV. The compass indication was fine and battery indication and satellite status was good. Flew around for 20 mins with no FPV at all. When I landed I found the reason for no FPV signal, when the camera had tilted it had jammed against the tracker and had immediately cut off the FPV signal. Learn something new everyday with this baby !