Auto-close door with a shutter for closing an area at least partially defined by a frame, said auto-close door comprising: A motorized driving mechanism for moving a leading edge of the shutter in a first direction (α) to close said area defined within said frame and in a second direction (β) to open said area; Wave detection cells suitable for detecting the presence of an obstacle within the area defined by the frame; and/or In addition or alternatively, an impact detector suitable for detecting an impacting event with the leading edge of the shutter, A processing unit programmed to carry out the following operations: (a) Upon opening the area a first time by moving the leading edge of the shutter in said second direction (β), maintain the area open for an opening time, t1, after which (b) close the shutter, (c) Record whether an obstacle and/or an impacting event is detected by the wave detector or the impact detector, upon closing the shutter; (d) Count the number, n, of obstacles and/or impacting events detected during a number, N, of repetitions of the cycle defined by steps (a) to (c), and if an event frequency n / N > v ref,1, wherein, v ref,1, is a first control ratio, then the opening time, t1, is prolonged to a time, t2 = t1 + Δt2, wherein Δt2 > 0; (e) Repeat steps (a) to (d) with the values t1 or t2 determined in step (d). A motorized driving mechanism for moving a leading edge of the shutter in a first direction (α) to close said area defined within said frame and in a second direction (β) to open said area; Wave detection cells suitable for detecting the presence of an obstacle within the area defined by the frame; and/or In addition or alternatively, an impact detector suitable for detecting an impacting event with the leading edge of the shutter, A processing unit programmed to carry out the following operations: (a) Upon opening the area a first time by moving the leading edge of the shutter in said second direction (β), maintain the area open for an opening time, t1, after which (b) close the shutter, (c) Record whether an obstacle and/or an impacting event is detected by the wave detector or the impact detector, upon closing the shutter; (d) Count the number, n, of obstacles and/or impacting events detected during a number, N, of repetitions of the cycle defined by steps (a) to (c), and if an event frequency n / N > v ref,1, wherein, v ref,1, is a first control ratio, then the opening time, t1, is prolonged to a time, t2 = t1 + Δt2, wherein Δt2 > 0; (e) Repeat steps (a) to (d) with the values t1 or t2 determined in step (d). (a) Upon opening the area a first time by moving the leading edge of the shutter in said second direction (β), maintain the area open for an opening time, t1, after which (b) close the shutter, (c) Record whether an obstacle and/or an impacting event is detected by the wave detector or the impact detector, upon closing the shutter; (d) Count the number, n, of obstacles and/or impacting events detected during a number, N, of repetitions of the cycle defined by steps (a) to (c), and if an event frequency n / N > v ref,1, wherein, v ref,1, is a first control ratio, then the opening time, t1, is prolonged to a time, t2 = t1 + Δt2, wherein Δt2 > 0; (e) Repeat steps (a) to (d) with the values t1 or t2 determined in step (d).