MWB

I also stuck a bit of tape and the same happened, similarly slowly...but....now seems to have fixed itself. All I did was wind the seat as upright as it would go (nose to the steering wheel!), then back to my preferred position, and so far so good (about 200 miles done since then). I will update after another few hundred miles...

I,m having the same issue with my new 2021 Octavia estate....Will contact dealer tomorrow.

Same is happening with my new Octavia Mk 4. It is quite gradual but irritating on a brand new car. Not sure how it can be fixed?

My impression, after driving my Mk 4 Octavia 1.5 eTEC for a week, is that the ACC will react to vehicles or objects that are not straight ahead (with some unhelpful results) only if you use it with lane assist turned off. Turn on lane assist, and it seems to react only to the road in front (in your lane).