What are your PC specs? Runs 90FPS locked on a Lenovo Explorer with a GTX 1060 3GB and a Ryzen 7 2700.
Sorry for taking 152 days to respond, mine runs at 90fps as well on a Rift CV1, rx 570 and an r 1600x, so the crashes certainly aren't due to the specs
Might just be some dodgy AMD GPU compatibility then. I remember my Vega 56 not liking Destiny 2.