I have an S7 and an 8" Tab 4 from ATT and use both about equally. I don't turn anything off (bluetooth, wifi, etc), but I do force all apps to close before connecting. I have 89 flights since I got it (2 weeks ago) and the only software crash was once with Litchi. Fortunately it was near the end of a waypoint mission and the bird just finished it up and came home. Of course the controller kept working, so there was never any real problem and by the time it was coming home I had the app restarted and connected. I use GO4 probably twice as much as Litchi and GO4 has never crashed on me. I uninstalled GO because I never use it.