I hope my brief Spark experience may help some members. I have the Spark Combo, all going well except for difficulty finding the Spark on my WiFi unless I cycled the RC start. I changed to an OTG, no luck until I swapped the cable and then it worked pretty well. Yesterday I had an uncommanded landing, no damage, re calibrated IMU. Next take-off, uncommanded horizontal flight, fortunately it stopped at an obstacle but afterwards, it would not fly forwards, all other directions seemed okay. Spark has an additional 'noise' internally. Perhaps a bearing . Good battery, good GPS, no metallic or other interference. I called support who told me that my Moto 4G play is incompatible. Maybe but surely the flight commands come from the RC unit, or am I missing something? I have arranged a return with the seller.