Campaign Glitch/Bug - Unable to Progress

My issue started with the campaign loading in on the open world but every 10-15 seconds Chief would randomly despawn, weapons would just hit the ground and I could swivel the camera around a bit until Chief would respawn in again, then the despawn issue would repeat.

I quit out only to run into a bug where the save would not load up at all, the countdown would go 3-2-1 then nothing would happen.

Gave up and started a new game, but the screen would kind of flash to black every second or so during the opening Pelican scene, then as soon as the mission was supposed to start I got loaded in outside the playable are without a body, restarted again which seemed to fix that but then as soon as the mission started properly the despawn issued happened again making it impossible to progress.