Playing the My Team career and up to Season 2. I routinely qualify pole and my teammate qualifies P2, but when starting the main race itself my teammate is hugely faster than me in corners, accelerating out of corners, and straight line speed. At lights out, their launch is insanely quick and they take P1 immediately, and within 1/2 a lap they are a good 4 to 5 seconds ahead of me, while the rest of the AI is roughly 1 second behind me like normal. At this point it becomes impossible to ever catch my teammate even with overtake ERS, unless they pit earlier than me, and then they are usually back at P1 within a lap or two of coming back out.
On the engineering/RnD department screens it shows both cars have the exact same performance and upgrades, and engine wear on both cars is within 1-2% of each other.
When noticing this occurs in a race, I open the pause menu and restart the session, and then my teammate's car is suddenly back to normal performance and I am able to hold P1 for the rest of the session. No other changes are made to car setups or pit strategies etc, all I do is just restart the session and try it again, and their car's performance is back to the same level as mine.
This seems to only affect my teammate's car, the rest of the AI behaves like normal.
Playing on PC, if relevant my tech specs are
i9 9900K
RTX 2080ti
32GB DDR4
Game installed on M.2 SSD