Borusssia Dortmund was 6 points ahead of Bayern and they were on top of the table

eftadi had a quick thing to say said
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A few weeks ago Borusssia Dortmund was 6 points ahead of Bayern and they were on top of the table. Now they are 9 points behind Bayern. What is wrong with Dortmund? What should they do if they want to win the Bundesliga this season?