Driving along, merging onto Interstate, various warnings such as check lane keeping assist, and warnings to stop vehicle and check brake systems. Driving approximately 50mph, the warning started to flash and speedometer dropped to zero then went back to full speed. Automatic braking was attempting to slow the car. Attached photo shows an indicated speed of 0mph, however was travelling approximately 50mph at this time. I also have video of the errors occurring, but there is not a way to upload video.