MAX VERSTAPPEN'S is growing "irritable" with reliability issues at Red Bull, according to his dad.
Writing in his column, Jos Verstappen hailed his son's win at the Miami Grand Prix but revealed it was not plain sailing.
Reigning F1 champ Verstappen recovered from early-weekend car issues to beat overall championship leader Charles Leclerc in Florida.
The Ferrari ace holds a 19-point advantage over Verstappen after five rounds of the new season.
Jos revealed reliability issues with his RB18 car had limited his son's time to practise on Friday.
He said: "What an insanely good result for Max in Miami! He looked very strong again in the race after a difficult start to the weekend.
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"Problems with the car on Friday meant he got very little practice, and you need that time to adjust the car, especially on a new street circuit.
"I could understand why he was a bit irritable. It was a shame he made a mistake in qualifying, but that can happen.
"It didn't help that he didn't know the track as well as he normally does."
He added: "If the reliability of the Red Bull proves to be good, then I think Max will have another strong season, and we will have a thrilling duel between him and Leclerc."
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Verstappen will be looking to strengthen his title defence at the Spanish GP later this month.
Mercedes star Lewis Hamilton won in Spain last year but is well off the pace so far this season with just 36 points on the board.
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