Excessive lag upon opening maps, recovery after falls / drowning, etc.

Occasionally, the game will freeze in an excessive lag period when opening the map or being recovered after a fall / drowning.

In the case of opening the map, the audio stinger triggers but the game does not open the map; instead, it freezes movement and allows you to rotate the camera around Rook but disallows input. After 1 - 2 minutes, the map opens. 

In the case of fall / drowning recovery, the game freezes on a black screen. After 1 - 2 minutes, it resumes recovery and returns to gameplay. 

I have not been able to figure out the cause. I play on PC, and have tried reducing my graphics presets from Ultra to High, and I have tried turning off various display settings, such as triple buffering or adjusting caps for frame rates. Nothing has fixed it yet. I am well under the recommended limit for VRAM usage, as well, even when on Ultra.