See the impact sound here: ? v=TWfQG26j3y8 ? v=pF6MzTB8I9g One person made a good review, but hesitated to spread the sounds of impacts and delicately muffled the sound. ? t=231 For the first time, the robot stopped in front of the wall, moved away, took aim, poured some water and went forward all the way. . After 1-1.5 weeks, the robot came to his senses and began to see everything. Stopped beating. What helped is not clear. Many times they reset it to the factory settings, let it build a map again. and at some point it came to its senses. I would like to say a few words about their official service center on Ryabyanova Street. in Hong Kong. Let's start, as I wrote above, that they watched the video and recognized such blows as the NORM. Their response dated 08/25/21 "We watched the video more than once, we did not find any deviations from the norm of behavior - any Irobot robot interacts with the objects of the surrounding world with its front bumper. " Then the robot came to his senses and began to work normally. But one day I stopped visiting the base and started giving an Error. In the application, the errorcomde (43) is written in black and white and what to do. I moved the station back and forth, it does not help. Let's call the service again. The answer killed me. There is NO such error. I say no, your application shows me and tells me what to do, there is such an error on the site . Custhelp.Com/app/answers/detail/a_id/25100. And we say there is none. My dear official service centers, how do you repair something for which you don’t even have a Manual?