This is my first post. I been having problems with the automatic transmission in my 530d 2008. When I been driving like 20 minutes in hi speeds suddenly the transmission disconnects and the the screen displays a message that says the transmision is damaged. But when I turn the car off and on again, the message disappears and the gear box works fine again unless I go on hi speeds again. If I don't go over 100 km/h it doesn't give me any problems. I'm thinking it may be an overheating problem or something... I just bought the car and I didn't check the ATF level.
Any ideas what could it be?