same here my drone has gone fron my inventory but i can still use it on missions just cant upgrade it also when i equip a different gun to upgrade that gun stays in my inventory so when im on mission i go to switch to secondary gun and it goes through all other sniper rifles i have used first some ppl might like having 5 different sniper rifles in their inventory but not me switching from one gun to another is a pain only experienced these problems with second trainerMy drone has gone from weapon stationary in main bases using second trainer, so I can't upgrade it