No progress, the same technical deficiencies

I had broken 2 predecessors, who was first after half a year, the next after only 4 weeks. Now I have this model at home, had hoped real progress, the so unfortunately there is not. Battery performance is at the highest level that I need despite tiles, as long as the previous model, ok that was clear to me would not bother me even further. What I find, however, is very disturbing that the dog hair, as in the previous model, caught scary to the rotary brush and downright screw in the rotation mechanism, so it is to get out again not possible, I have tried it with tweezers, everything pointless. The real problem at this fact is that the rotary brush is not turning back in a few weeks, as with my 2 previous model! This means that equipment will have to be sent back in some time.
I was initially very enthusiastic about the handling, so I also wanted no ordinary vacuum cleaner longer, I have everything done with this sucker, now I am very dissatisfied with the product. Fortunately, Amazon has very simple return, so you do not additionally similar over poor service would annoy!