Hi! Similar problem there. 30-th of April I bought Marksman DLC (no other DLC purchased and no such issues before) and this CTD starts one after another, the game was ruined. Many times it was then the loading slider was nearly 90%. Some times while gameplay (network King of the Hill maps).

rpt and bidmp attached in two zips (22 MB unpacked)

Sys specs:
MB: Gigabyte ga-z77x-d3h
Proc: Intel I5-3570K
RAM: 8 GB
Video: MSI GTX 770 Gaming 2GB (driver 350.12)
HDD game installed on - SSD (no pagefile)
pagefile.sys on system drive C - 8 GB (not SSD)
Win 7 x64

Half-randomly for me. As I sayd, most times it was during level loading at nearly 90% (top one loading slider/bar, not second mission-loading in center near picture). If loading let me trough, then CTD after 1 to 30 minutes of gameplay.
Also I played 2-3 hours of the same evening (and days earlier) before DLC purchase and nothing like that happens. Maybe you will try to look from that perspective?

Here is info:
https://youtu.be/4KiKmLQ4gwU

Specs:
i5 3570K
8 GB RAM
MSI GF GTX 770 2GB (driver v347.88)

no mods, verified, ssd no defrag/errors.

Maybe... Than this is my mistake.