The latest incident occurred in the opening 90-minute practice session after Vettel's future teammate Charles Leclerc, who is moving to Ferrari in 2019, dragged gravel onto the circuit with his Sauber vehicle.
Sebastian Vettel's punishment of a three-place grid drop for the United States Grand Prix and licence penalty points is "quite harsh", Toro Rosso Formula 1 driver Pierre Gasly believes.
The German struggled through a hard day of slithering in the rain and then picked up a three-place grid penalty for Sunday's race for speeding under red flags during the morning session.
When a red flag is shown, all drivers are required to drive to a reduced pace and return to the pits.
The stewards, having viewed the relevant video evidence, positioning data and telemetry, and heard from a team representative, found that Vettel failed to stay above the minimum time set by the FIA ECU in marshalling sectors 6 and 7.
"I think in the wet, when a red flag comes out, it's potentially risky to slam on the brakes", he said.
"The stewards disagree, there's nothing more to say about it", Vettel added.
Esteban Ocon of Force India and Daniel Ricciardo of Red Bull were given three-place penalties for speeding under red flags at the Japanese and Australian Grands Prix respectively. I think on top there might have been an issue with the timing, with the system, I don't know. "Lining out 27.7 seconds precisely, as not complying with the rules, I think is wrong".
"[For example] if you're halfway through Turns 17 and 18 [the fast double-right hander] it's a bit tricky to slow down as much as you should".
"There should be common sense with the rules that we have", he said.
"I think if I was in the same position they would probably do the same thing so it's more as drivers we are all members of the GPDA and I think we all just need to stick together and I think the respect that we have for one another I think is probably the greatest that it's been for many years. To be consistent with previous decisions on similar incidents this year, the Stewards assessed the penalty specified above". I should have slowed to 30kph but then maybe a vehicle behind me would have crashed into me, and what's the point of that?
"But in my opinion it's not the right thing because if there is a auto behind you it might run into you but it's more important that you don't get a penalty".