The game itself has not changed since 1.1.3 was released over a month ago.
Are these crashes all in one particular campaign? Or also in any new one you might start as a test?
If in one particular campaign, it's probably worth making a new thread in Bug Reports and attaching it there.
If it is happening any any new campaign you start too, I guess a Windows or driver update has happened, or the game installation may be bad: in that situation
do a full **clean** re-install:
- move any valued save games elsewhere
- "uninstall" in Steam-CK3
- manually delete both the Steam/SteamApps/common/CK3 AND Documents/Paradox/CK3 folders
- re-install game in Steam, run a Steam Verify when done.
- add CK3.exe to the exceptions list of your antivirus app; ESPECIALLY if you have Windows Defender, add it to the Ransomware "Apps Allowed Through" list.
- start the game with no mods active and test
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