While driving our 2019 Outback, all of the sudden the steering wheel would jerk like you were on a slushy road. Took it to the dealer and the told us to shut off the lane deviation. They said all new Subaru cars have experienced this along with Chevy Silverados. There is a glitch in the computer and they are aware of the problem. Usually happens at high speeds. Warning light read Keep Both Hands on Steering Wheel.
I have a 2018 Outback, that has the same lane deviantion system. When it jerks back it is just a slight jerk, not enough to put your car out of control. If you are changing lanes and do not turn on the the turn signal it will firs give a slight jerk, and if you keep turning into the lane it will light up a signal. This is a safety issue to reduce accidents caused by sleepy drivers.