F430 CST Activates in straight line

Hi guys something strange happened. I took the F430 for a road trip. Part of this was on highway and it happened 4 times that the CST became active while on an almost straight road. I was just turning slightly right.
Speed was about 130 km/h.
When I was driving on smaller roads with curves all was ok.
This happened randomly during the day.

I recently changed the four tires but the new ones are standard size as requested by the manuals.

Any ideas???

Thanks in advance for any help.

Michel

 

Thanks, I will check that....