Disqualified from race for unexplained tyre violation

Also experienced this in 2 separate two player careers with friends, both of which we’ve had to give up on because of this, because honestly it makes it unplayable. We experienced it on: Imola, Miami, Canada & Brazil. Tried the suggested strategy, tried a custom strategy, on one race we did a 4 stop (for a 25% race…) and it still disqualified for not using the correct compound. Unplayable in this state and so frustrating.