That one has been reported before. Could be moving traffic on the left and confusion about whether the car is driving on the left or right. First undertaking prevention where it senses via the lane assist camera movement. It sees vehicles on the right and decides you are undertaking so stops you. Happens in tail backs at junctions. Then if you get the confusion about whether the car thinks it's driving on the left or right stops you overtaking as normal. Think that one is being sorted out via updates in the vehicles that were doing it. Just leaves the undertaking issue where at junctions you can undertake or if in lines of traffic. It can also read the variable traffic speed cameras and cause havoc.
The undertaking issue can be sorted out be
Obdeleven / VCDS
coding where you turn off the sensing of movement on the left and right of the car. See the
coding section on the
Formentor thread for that. The other thing you can do is to default lane assist to last setting. That way if you don't like lane assist it stays off till you next turn it back on yourself. That
coding is on the
Formentor thread /
Tarraco thread. Backing both horses on this one I think it uses perco parameter
Ateca like the
Tarraco whilst the
Formentor like the Leon 4 uses the other one. Conversation on the
Formentor thread where I was got at for naming perco although thanked on the
Obdeleven boards incorrectly

. Just a different parameter between platforms is used on that one.
Personally I don't use lane assist but I do use TSR to keep within speed limits. TSR being a function of lane assist.