1. In the summer, when it is very hot and the V8 is in the cool sun.
Makes the display of the residual range incorrect (far too little). After a few meters drive, she's about right again. Turn off the engine, restart again and the game starts from the front.
2. Even in the summer. After a longer city ride at low speed, the engine starts to jump up and down from 1000 to 1800 revolutions (very strong jerking).
On the highway, giving gas and the problem is gone again.
I had both mistakes several times last summer, not since then. Luckily.

Where do these mistakes come from?
Yours sincerely,
Alex