I heard an interview with Bautista that said that the soft compund worked good with his bike for almost 22 laps. Problem arised when they used hard and super-hard compound, that tend to slip more during accelerations, overheat and consume sooner.
Also Dovizioso said that there is a phenomenon of "blistering" after a certain number of laps that they don't know how to deal with (basically confirming what Bootlace already wrote).
My head is my only house unless it rains.
D. Van Vliet