West Ham boss Gianfranco Zola admits he needs to find answers quickly after his side suffered another home defeat.
The Hammers were arguably the better side in their 2-1 loss to Everton and Zola was at a loss trying to work out how they did drop three more points and drop back into the relegation zone.
"It is a big question mark for me, how can we lose a game like that," he said.
"We have to analyse the problems first and find solutions.
"I felt the players gave everything. Their attitude and their commitment was very good.
"But we have to find out straight away what is not working well, because it is not doing us any favours.
"What can you do? We probably need to show even more desire.
"When I look into things I can only see the team tried until the end.
"We are making mistakes, but we are fighting and we want to change things."
Zola admitted that overall he was not too worried as he believes the club has a good fighting spirit.
"I am not worried because I think we can certainly improve the situation," he added.
"We are going to fight until the end and we will find the solutions and we will find them as quickly as possible.
"I am confident and I trust the players. We are determined to make things different, and that is what matters."