I was driving to work this morning and engaged FSD mode in standard when suddenly the vehicle began to speed towards traffic and did not slow down while approaching a stopped semi truck. When I tried to brake, the FSD mode did not disengage and the car skidded a bit before I swerved out of the way to avoid the truck. FSD was still engaged for another minute or two before I was finally able to get it to turn disengage. The vehicle was stuck in FSD mode and speeding for about 3 minutes before I was able to gain control back.