I just saw an interview with Daniel, he said the medium tires were great in FP3, but the soft tires in FP3 and qualifying didn’t work as well as they had on Friday, and the car setup was essentially unchanged.
Quite a few drivers seemed really unhappy with the soft tires not being consistent across sets. Apparently Pirelli were particularly upset by George being extra blunt.
Perez also said “I think we had good preparation through Q1, but in Q2 there was something going funny with the tyres,” he told the official F1 channel.