The following fixes have been made in regards to the connection issues:
- Fixed an issue where error messages would display and kick players offline when searching for online sessions.
Also readjusted the matchmaking function to make it easier to find an online session via "Search for an Online Session" > "Matchmake".
- Fixed an issue where error messages would display and kick players offline after having joined an online session.
- Fixed an issue where error messages would display and kick players offline while playing multiplayer.
This adjustment reduces the number of occurrences, though it does not completely resolve the issue. We will continue to investigate this matter.
- Fixed an issue where the error message "E_FAIL : hr" would display and the game would crash when switching to full screen mode.
Important: You must update to the latest version of MONSTER HUNTER: WORLD to apply the fixes above. The latest version of the game is revision number 151910. You must close and reopen the game for the update to take place. You can verify the version number in the top-left corner when you launch the game in window mode. Keep in mind that you can only match with other players who have the same update version as you.
For other questions, please visit the official MONSTER HUNTER: WORLD support portal below.
http://www.capcom.com/mhwsupport/