I had a runaway situation once luckily in sight when it happened so at least the remnants were recovered. Your situation sounds ominous but before pointing fingers you do really need to line up your ducks. I know, it’s a lot of money, but every time we dust off we are taking a chance. Everyone keeps talking about the flight log and I think thats key. If your police boat beamed you and killed your $2500 rig, they owe you recompense, if it was a random software thing I think DJI would do you u right