Hello i have a 2007 volvo s80 D5. Today after cleaning my car i started it up to drive, and saw some failtures: Abs, Dtsc.. In display there was saying that there is also headlamp failture and brake system failture and red triangle indicated. I looked at my headlaps , everything was working fine, then i tested abs and it worked as well good. Speedometer did not shown speed and trip odometer was showing : ---.

Then i restarted car but the problem was the same. After driving ~5km i restarted car and all problems was gone, so those was false problems. Anyone know what might been happen there? Is it possible that it would start doing this in the future? whats the solution for this problem?

Thank you in advance