#3 Warriors are their biggest enemy
We've seen all through this past regular season and even through some games in these 2018 NBA Playoffs - the Warriors are their own worst enemy. Either that or the Warriors just decide to win games by playing just one good quarter in some games.
In the regular season, the Warriors averaged 14.8 turnovers in wins and 16.9 in losses. In the Playoffs, that difference grows as they get very clinical in their wins and even more sloppy in their losses - 12.5 in wins and 15.8 in losses. Those turnovers combined with rushed shots and no ball movement, and the Warriors can often play into their opponent's hands which is what the Houston Rockets forced them to do, especially in Games 4 and 5.
Having said that, don't blame them. The Warriors' margin for error is so huge that they can afford to play their worst half in an entire season and still win a game by double-digits (Game 7 Vs the Rockets).