After thrashing Crystal Palace 7-0 on December 19, Liverpool were six points clear at the Premier League summit.
Roberto Firmino, Sadio Mane and Mohamed Salah were all on target in the clinical rout at Selhurst Park, after which Jurgen Klopp said: It was really difficult to play against us.
The reigning champions had seemingly found top gear again.
Fast forward to January 21 and, following a stunning 1-0 loss to Burnley at Anfield, Liverpool were left to wonder just where it had all gone so badly wrong.
For a fourth successive outing in the league they had failed to score, while the shock result sees them stuck in fourth position in the table, six points behind leaders Manchester United.
Never mind moving through the gears: th…