Bayern Munich does not seem to be in too much trouble at the moment. To be honest, they are not in any kind of trouble at all. In terms of their position at the table, they are not too far behind. At the end of the season, I believe they will be the ones who will win the Bundesliga title. In spite of the fact that right now it seems like Bayern Munich will not be able to win the Bundesliga title this year.
However, I also know that there is no team this season that is capable of actually being consistent enough to be able to beat Bayern Munich in the race for the title. My personal opinion is that Bayern Munich will not be able to do well in the Champions League this year. However, I don't think that they will lose the Bundesliga titles to any other team.
It's true that their form hasn't really been a problem but because we've seen them top of the table from the start of the season so far there are a few differences that are visible which makes it a bit odd.
But in this case actually for Bayern they are just a matter of time I think. Currently they are in 3rd position and the clubs above are Freiburg and Union. I think this will only last a little while because sooner or later these two clubs will be eliminated at the top of the table and at least allow them to compete at 2-4 position.