Mercedes team boss
Toto Wolff believes his team is not in a "good place" despite leading the constructor's championship standings.
Mercedes have struggled since the opening race of the season where they dominated but lost out on the race win due to the virtual safety car. Since Hamilton's pole in Melbourne, Ferrari has locked out the front-row in both Bahrain and China.
"We were overheating the tyres," Wolff said.
"We're not in a good place.
"We're bouncing between freezing and overheating.
"You can see when we hit the sweet spot like we did in Melbourne we are very fast, the lap pace of the car is very good."
Wolff was left shocked with the change in the pecking order after winter testing, where Mercedes dominated the pace.
"In Formula 1 there is never a quick fix. You can see how fast the picture can change. In testing and in Melbourne you could predict that we would run away with the championship because the car was so dominant. And here we go three races in and we're not,” he added.
"In my opinion, this is a great group of people. We just need to stick our heads together, stay calm, get the head down, and come up with solutions. I have huge confidence in the people. They've proved that in the past."