After being blitzed at the start in the last two races, Toto Wolff is "very concerned" about Mercedes struggles off the line.
Mercedes have failed to make their front row shut-outs at both the British Grand Prix and on Sunday in Hungary count.
At Silverstone, it was the two Williams cars driven by Felipe Massa and Valtteri Bottas that stunned the Brackley outfit once the lights went out
If Mercedes had thought that was a one-off, they were rudely awoken when both Sebastian Vettel and Kimi Raikkonen blasted their way past at Hungaroring.
Raikkonen, who has started the furthest back in fifth, was briefly involved in a duel for second with Rosberg, before forcing his way past.
Wolff, the motorsport boss at German manufacturer, admits he is worried about the poor starts his team has experienced lately.
“We got jumped by two Williams' last time, and jumped by two Ferraris this time. This was what triggered the whole mess, and then the lap one incident," he said.
“We need to get on top of the situation. It is not acceptable and it needs to be analysed why it happened. It is many various reasons, it is not one particular one. If you look at it, not good.”
Mercedes might have further concerns when the teams return from their summer break. Rule changes, scheduled for the Belgian Grand Prix, mean that drivers will have less help during race starts.
Wolff concedes that there seem to be many factors contributing to their current problems.
“It is various issues," he said.
“It is very difficult to get the calibration right."
Wolff pointed out that the problem also seems to be intermittent.
“We had two very good practice starts off the line and then when it mattered, on the actual race start, we had too much wheel spin. Then you get overtaken in a way you cannot recover.”