Hi everyone, we've been looking into this since last night, hoping to ID a fix soon.
1) For anyone on Xbox One or Xbox One X that has Gravity Bomb and is experiencing crashing or performance issues, please start a ticket with us on support.rocketleague.com so we can collect more information.
2) If you're having a similar problem with Gravity Bomb on another platform (like PS4 Pro), please let me know here.