Roomba discovery always goes back HELP!

Hi,

my roomba discovery only goes back after touching an obstacle.
Why?Sensor problem?
I have posted an video.
Thanks very much for any sugestions!

@ignis

There is no sensor to prevent the hit of obstacles in the Roomba. It will slow down a bit before touching or entering into contact with an obstacle. We cannot see the video you have posted.
If you want to troubleshoot further, you may also contact us via the support center. Also, we can verify your information and warranty.

I try to explain myself better. My roomba discovery has a problem going back until it crashes against an obstacle. The reverse gear once inserted does not lock. They may be wheel diodes or a board problem
I attach a sketch. Thank you