Flew my Spark this evening and about 5 minutes in the flight st over 800 ft from me I lost the signal  and disconnect from aircraft came up. I was using an otg  and had smart phone on airplane mode and blue tooth off. Has anyone experienced this?

Please tell me your model of mobile. What about the GPS signal? Good or bad? When you lost the signal, any error message from your app and could you see the image? Please upload the video if you shoot at that time. Thanks.