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Robert Kubica has admitted Williams' drivers are suffering from more than just a lack of pace in 2018.
In Barcelona, Sergey Sirotkin admitted he struggled throughout the weekend with "seat comfort".
"Let's say it this way to not upset anyone - the problem is with seat comfort," said the Russian.
Problems at Williams
It is believed Lance Stroll is suffering with a similar problem, and Robert Kubica, Williams' reserve driver, confirmed the issue.
READ: Williams car 'simply not good enough' - Kubica
"We do not have too much comfort in this car, but it has been known since November. Problems have to be solved in the winter rather than pretending that everything is good to make it look nice politically.
I do not drive, so I don't say anything else, the former BMW and Renault driver added.