Board Thread:General Discussion/@comment-26341407-20160126103317/@comment-25370154-20160126145124

Well, the first "warning" message is not a problem at all. Everyone can have a connection issue. The problems may arise if you keep playing and every other host leaves the match forcing you to quit before the time.

Anyway, to check your status:

Options → Statistics → Progression Rank (S >>>> D)

"S" and "A" mean "no problem", the other letters will give you only 1 room every time to join, until you increase your rank.