Just for info really, looks like version 3.0.2 of the DJI Go app realeased a few days ago is causing problems with logs getting deleted and/or removing any GPS/Map data. As mentioned on this forum before, it's worth holding off any updates for a while!
Instructions for disabling auto-updates in iOS HERE
Thread on the DJI forums about it HERE
Instructions for disabling auto-updates in iOS HERE
Thread on the DJI forums about it HERE