DART Model Spawn Segmentation Fault

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Hi, I am spawning a Box using the ros service /gazebo/spawn_urdf_model from a Python node. Very rarely (every hour or so) Gazebo segmentation faults with the below error.

[Dbg] [DARTModel.cc:72] Initializing DART model box 
[Dbg] [DARTModel.cc:128] Building DART BodyNode for link 'box_link' with a free joint. 
Segmentation fault (core dumped) 
[gazebo-2] process has died [pid 31347, exit code 139, cmd /opt/ros/noetic/lib/gazebo_ros/gzserver
    --verbose -e dart/ ~/catkin_ws/src/project/worlds/reflex.world
            __name:=gazebo __log:=/output/08d98536-d081-11eb-b0a7-8c0f6f7e4edf/gazebo-2.log]. log file: /output/08d98536-d081-11eb-b0a7-8c0f6f7e4edf/gazebo-2*.log

Has anyone come across this? I'm using Gazebo 11 + DART 6 + Bullet collision checking