The Hornets, wjho were beaten by Connor Wickham's goal, are not only losing at home but they have also stopped scoring at Vicarage Road.
This was the fourth game running they have fired blanks in front of their own fans and head coach Zola said of Ikechi Anya's first-half effort that was ruled out for offside: "We did score and it was disallowed and it was actually a goal.
"In front of the goalkeeper we are not as confident as were some time ago and, to be honest, it is becoming very difficult to get people in front of the goalkeeper because of the way the opposition plays.
"They stay very much at the back and we don't create enough opportunities. So that is the situation. It hasn't been easy.
"We tried to do something different, just to play one striker less and to have a more balanced team. We created some chances but they weren't enough.
"What is the real problem? I don't know. We are not going through a good moment in terms of confidence because we produce chances but it's difficult for us to score.
"And when they (the opposition) attack, they do it once and then they score so that certainly doesn't help the confidence of the players. That is what is creating a lot of pressure with the players and everyone.
"I know football is about results and results are more important than anything. I understand that and I'll see what is the best thing to do."