I don’t know what the problem is, but in a year and a half the suction motor fails for the second time, the vacuum cleaner starts to ride and disperse the sand around the house. The first time they took it under warranty six months later, according to the coupon, the motor was replaced, the new one was enough for another 7 months. There is an application, but the settings are rather clumsy. Cleaning algorithms also periodically make strange decisions. If during the cleaning process the vacuum cleaner is unsuccessfully moved, it will draw a "room in the room" on the map and the cleaning will become chaotic, you will have to reset the map. It's like a vr helmet made of cardboard - not expensive, not reliable, a little crooked in execution, but in general it performs the declared functions and is suitable for getting acquainted with such a device as a robot vacuum cleaner. If you like the concept, then it is better to sell and buy a more expensive high-quality model (perhaps from another manufacturer). 09/10/2022 Because I met several mentions of a problem with suction stopping working, I dismantled the vacuum cleaner myself. The source of the problem is clogging of the motor turntable (1). In the normal state, the grate leading to it is closed by the filter of the garbage container (2), but if the container is removed, the grate no longer has any protection, and the cells are large enough for large debris to penetrate (3). Those. if you took out the container, part of the garbage woke up from it, and you wanted to turn the vacuum cleaner over to, for example, clean the brushes, then some of the spilled garbage will probably fall into the spinner compartment and then either jam or wrap around the axis. If you want to extend the life of the vacuum cleaner, or make sure that there is no debris in the container slot, or collect a net there. If someone decides to disassemble it himself and, having unscrewed all the screws, will not understand what is holding the top cover, here is a photo (4). The stiffening ribs of the top cover are not symmetrical (there are on the right, not on the left) and the wheel spring will cling to one of them . But remember the warranty that you will lose if you repair it yourself. Good luck =)