Lost connection at random and lost items

Ok so I was playing warzone and I used a legendary XP boost which if possible I would atleast like back because those things are hard to get, but not getting off topic I was in warzone I use the boost and two ultra rare random vehicles (got a phaeton and oni mantis NOT KIDDING) and I randomly lost connection to. After being pretty mad for a few mins I looked at my commendation to see the 7 kills I got with my phaeton and the 11 I got with the mantis didn’t count and I don’t have the legendary XP boost. This is not the first time it’s happened either honestly I don’t spawn stuff in because of this issue and I feel like it needs to be fixed.