Manager Gianfranco Zola admitted he is concerned about his side's form after they conceded three late goals to crash to a 3-1 home defeat against Everton.
The Toffees' victory keeps them in seventh place in the Premier League table but West Ham are now just two points off the relegation places, without a clean sheet in 24 league games and a win in the last six.
"It's very difficult to accept," said Zola. "It is not the first time we've spoilt a good job in the last 10 minutes of a game. It is something that concerns me very much, obviously."
He added: "It is something that has to be looked at very carefully in a very deep way. The only thing I can say right now is that we need to find a solution. It is just a pity we spoiled 80 good minutes in the last 10.
"Maybe I have to give something more because the Premier League is punishing. You cannot afford to drop your attention for a minute.
"We are aware of the situation we are in. But we don't have to panic. We have to look at the good things we are doing.
"We have to make sure we do the right things for 95 minutes. That's what I will be focusing on next week."
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