I see They are starting to feel like a club that cannot be beaten in the English Premier League. This has caused their performance to decline slightly in the last few matches. Maybe you understand what I mean, when we feel too strong, we will definitely underestimate the opponent.
I'm not agree with your statement, as LFC fans, they only lost focus for a while, maybe they underestimated Watford because club that they are face is in relegation zone, but I'm sure they aren't think cannot beaten in every match.
In FA they meet strong club, LFC will proven that's they are still on track.