Are Arsenal facing a slump?

Question

In 2006 Arsenal were leading the Premier League when they fielded a weakened side against Manchester United in the FA Cup and went down 4-0. They then went on a horrendous run of form which saw United overhaul them and win the league.
After fielding a weakened side at the weekend, Arsene Wenger will be hoping that his side won't suffer the same fate in their upcoming fixtures when they play Aston Villa, Manchester United, Liverpool and Chelsea.