Every week or so, launching any activity with a fireteam causes my game to crash with the error code Marmot appearing. Afterwards, the game continues to run with the only way to close it being task manager. This problem will continue until I intentionally delete some files, then verify game files through steam. I have tried fully reinstalling Destiny, along with fully reinstalling Steam. What could be causing this?
Try this please. Clearing Steam Download Cache
https://help.steampowered.com/en/faqs/view/6AD7-820D-8BE5-E51F
This was by Steam guide by Troubleshooting.
Also here is article about Steam guide
https://help.bungie.net/hc/en-us/articles/360049024592-Destiny-2-Steam-Guide