A week is a long time in Formula One, just ask Toro Rosso driver Daniel Ricciardo.
Having scored his first points in China with a seventh-placed finish last week, Ricciardo headed to Bahrain high on confidence, hoping to stay in the top 10.
He started the race in P13, but things just didn't go his way on the Sunday afternoon as he struggled to get going and eventually had to settle for 16th place.
Needless to say it was a frustrating day and the Australian admits his race was "just awful".
"It's something we need to go away and understand," he said in his blog on the official Toro Rosso website.
"Even taking into account this is a different circuit with different demands and different tyres, it's just not normal for the car to change that much from one week to the next - particularly when we haven't done anything to it.
He added: "I had the slowest lap of the race, eight-tenths slower than one of the Marussias and I finished the race only 9s clear of one of the Caterhams.
"As I haven't forgotten how to drive in the last seven days, there's something wrong with the car that we need to understand. That performance has gone somewhere. It has to be something big - but not necessarily something easy to find. There's a variable in there that we have to dig out."
It has been a pretty mixed start to the season by Toro Rosso with Ricciardo and team-mate Jean-Eric Vergne finishing in the points just once each.
"Looking at these first four races as a whole, we haven't really found a happy medium," he said. "China was great, the other three haven't been up to scratch, so it's difficult to assess where we are. Something to look forward to is that the next race, in Barcelona, is likely to be a little bit more like China than any of the others. We'll also have updates on the car in Spain, which will be good."