He may be back in Formula One but Kamui Kobayashi is finding he's spending more time on the sidelines than on the race-track.
Having retired from the Australian GP at the very first corner, Kobayashi's woes continued in Malaysia on Friday.
The Japanese, who is back in the sport with Caterham, completed just five laps in FP1 before a "problem with his energy store" put him out of the running.
A major job for his mechanics it solve, Kobayashi did not put in a single lap in the day's second session.
"FP1 started ok," he explained. "We did the normal installation lap and then another three laps of the baseline run but then the power started cutting in and out and we had to box to take a look at the problem.
"It was pretty quickly identified as an energy store issue which meant we had to change the battery and that was the end of FP1 for me."
However, his troubles not over as the team then found "an oil leak when we took the floor off the car and that meant I wasn't able to run at all in FP2 as it would have taken too long to fix both issues.
"This isn't good, obviously, and I'm not happy that we've lost another Friday, but it is important to say that I know how hard everyone is working, in our team and at Renault, to try and fix these problems so we can have a proper race weekend."
Kobayashi, though, was at least encouraged to see his team-mate Marcus Ericsson putting in the laps, 24 in FP1 and a further 31 later in the day.
He added: "The fact Marcus was able to run the most laps of anyone in FP1 shows that we can be reliable - we just need to make sure both cars run like that for the rest of the weekend or we'll have another difficult race ahead."
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