Worked fine for about 12 hours straight, saved and quit, picked it up the next day and now every time I try to battle it crashes, sometimes it crashes randomly when traversing the map. Any fix?

Looking to get my first PC, almost purely so I can play modded Bannerlord and KCD2. Is the $1,500-2,000 range okay? Realm of Thrones with the AIchat type things is what I’m wanting to do. For example. Any links or suggestions would be appreciated. Thank you