Five observations from the weekend's Bundesliga action

But Borussia Dortmund are in freefall following another defeat, with bitter rivals Schalke up to second ahead of next week's derby in their first season under 32-year-old coach Domenico Tedesco.

Here are five things we learned in Germany this weekend:

Bosz gone by Christmas?

German daily Bild claim Dortmund bosses will hold showdown talks with coach Peter Bosz after their last league game this year on December 16.

It means the Dutchman has four weeks to turn things around after one win -- a 5-0 drubbing of minnows Magdeburg in the German Cup -- in his last eight games.

Dortmund lag nine points behind leaders Bayern in the Bundesliga as poor defending and goalkeeping blunders have blighted recent performances.

A mix-up between Marc Bartra and goalkeeper Roman Burki led to Chadrac Akolo's early goal on Friday while Stuttgart's Josip Brekalo fired between Burki's legs in the second half.

"It was almost ridiculous how we conceded the goals, but we won't give up!" said Bosz in Stuttgart as the latest defeat increased the pressure on him.

Tough talk for Vidal

Arturo Vidal was outstanding for Bayern against Augsburg as the Chilean midfield enforcer scored the opening goal and then set up Robert Lewandowski just before the break.

Head coach Jupp Heynckes revealed the performance came after he laid down the law last month.

"I had a conversation with Arturo two-and-a-half weeks ago. I wasn't happy with his physical condition and said he'd have to change something if he wanted to play," said Heynckes.

"From then on, he changed his attitude in training and has behaved differently."

Silver Lewandowski

Lewandowski dyed his hair silver and continued his golden goal run.

The Poland hot-shot has scored 18 goals in 13 league games against Augsburg for both Bayern (11 goals) and his former club Dortmund (seven).

After tucking away Vidal's pass on 38 minutes he drilled home Joshua Kimmich's cross four minutes after the break.

"The colour suits me because I have gotten older," said Lewandowski, who turns 30 in August, and joked that Heynckes, 72, was his inspiration.

Bayern's head coach was unfazed by Lewandowski's new coiffure.

"It's important he likes it and the most important thing is he scores goals," said Heynckes, who reached the Bundesliga milestone of 500 combined wins as a player and coach.

Wolfsburg happy to avoid record

After seven straight league draws, Wolfsburg finally broke the series with a 3-1 win over Freiburg.

An eighth successive draw would have been a Bundesliga record, which coach Martin Schmidt was pleased to avoid.

"It's good that this 'draw' story is over, now another team can worry about that," said the Swiss coach.

Wolfsburg last lost in September, but are only 13th in the league.

"Now we can busy ourselves with the longest run of wins in the Guinness Book of Records," said goal-scorer Yannick Gerhardt tongue-in-cheek.

Leipzig pegged back

Second-placed RB Leipzig twice threw away the lead in their 2-2 draw at Bayer Leverkusen and played the last 38 minutes against 10 men.

Goals by Leipzig's Timo Werner and Emil Forsberg were cancelled out by Leverkusen's Leon Bailey and Kevin Volland. 

The result left Leipzig third, six points behind Bayern, but head coach Ralph Hasenhuettl refuses to take sole responsibility for the lack of excitement in the Bundesliga title race.

"It's not our task to keep some tension in the league, there are also other teams whose challenge is to do that," said the Austrian.

"We have maintained a challenge over a period of time, I look at the table less than journalists."