Tri-cannon can't go through simple doors at times.

[Seeker042]

Sometimes it won't go into elevators or store doors, but rather sits and spins at the opening.  If I go into a mission afterward, it shows up there just fine.  Inside a mission, I usually have to respawn it.  It also gets hung up in the ceilings or walls of caves, unless I turn off hover and stay on the ground.