Did you ever resolve this without a replacement? I’ve just received mine and it’s randomly showing 13cm when there’s absolutely nothing at that range. The closest object is at around 30 cm.
Seems to be random, 1 hour ago it was reading correct at 136cm with a car in the garage, I’ve just checked it then and it’s showing 13, nothing has moved in that room at all since between that time.
Also where do you submit a ticket?