Mercedes boss Toto Wolff warned there are "no magic bullets" to understanding why Lewis Hamilton endured such a difficult Russian Grand Prix.
Hamilton trails Formula One championship leader Sebastian Vettel by 13 points ahead of the Spanish Grand Prix this weekend after the three-time world champion could only win one of the first four races of the season.
The Brit said he could understand problems he encountered following a fourth-placed finish in Sochi, where team-mate Valtteri Bottas claimed his first F1 victory.
But Wolff said Mercedes have had to go back to the drawing board and analyse why Hamilton was so short of pace.
"Lewis had a difficult weekend in both qualifying and the race," Wolff said. "We have spent our time since then unpicking what happened, to understand why we couldn't get the car in the right window so he could feel comfortable with it.
"There are no magic bullets to understanding that, just a lot of hard work and attention to detail. We must give him the tools he needs to do the job in the next races and that will be a big focus for us.
"The prevailing feeling is that there is lots of homework to do to come back stronger with a car that can perform on a consistent level every weekend.
"I have the feeling that we are moving in the right direction but we need 24/7 shifts to achieve our ultimate targets."
Wolff is also braced for Red Bull to make their presence felt with upgrades set to be made prior to the race in Barcelona this weekend.
"At the moment there are two top teams fighting for both championships and I expect Red Bull will also eventually join the club," Wolff added.
"The small margins we are seeing this season are demonstrated by the closeness at the top of the drivers' championship and even more so by the one-point advantage we have in the constructors'.
"This inter-team battle is a totally different situation than what we have seen over the last three years. You simply need to adapt to the challenge and that's what we are doing, playing the hunter as well as being the hunted.
"This fight will continue on to the end of the season and we will be prepared for that battle."