I'd agree with the poor run angle to some extent as it happened last season. But where it is different this year is that he doesnt know his best formation, he doesnt know his personnel in either formation, the players have lost their discipline and we have literally not been in the last two games. Atleast when we were bad last season, we were generally still in games to the end.
The counter to it all is that as you say, a month ago we came away from Old Trafford and everything was great. Smith therefore needs time to rectify this. Another couple of games like this though, performances and scoreline and his job is in the balance youd think.