I've attempted several motion timelapses and after several minutes of normal operation the gimbal goes limp, starts beeping, and a message (with a little lock icon) appears in the app saying to "Click to Reactivate Gimbal." Why is this happening?

I've attempted several motion timelapses and after several minutes of normal operation the gimbal goes limp, starts beeping, and a message (with a little lock icon) appears in the app saying to "Click to Reactivate Gimbal." Why is this happening?