Seriously Bayern management should fix their strategy especially in the attack to profit the most from Mane.. It is ridiculous what's happening there, losing vs Augsburg 
Leipzig also is doing terribly acting like a mid-table team rather than a top one.
Now Dortmund is leading the table and Union might claim it back tomorrow.
Im sure that union will take the first spot again. Bayern always has a very good performance during the champion league but it has a horrible performance on bundesliga. We have not yet entered into the middle of season. I think that bayern's management can fix it anytime. It seems like you shall not feel worry about that. People understood the main aim from bayern was champion league. Bayern have more chance to win the bundesliga. Union has a consistent performance but i didn't think if it will be last until the season will end. Leipzig also is doing terribly acting like a mid-table team rather than a top one.
Now Dortmund is leading the table and Union might claim it back tomorrow.
There will be lots of things happen anytime. people must wait until their teams will give them big surprised at the middle until the end of season.