EAC released a small update last week, and another yesterday - so I believe this may be related to that.
Some other players have had a similar issue, and found that by restarting Steam or Verifying Integrity of Game Files the issue resolved (though EAC still loaded slowly initially and needed a short wait) - I recommend trying this.
To Verify Integrity of Game Files:
- Right-click Vermintide 2 in your Steam library sidebar
- Select ‘Properties’
- Select the ‘Local Files’ tab
- Select the ‘Verify the Integrity of Game Files’ button
- When complete, close and reopen Steam
Please let me know how you get on.