Hi, I found an interesting report at a forum.
The user of A-bike said the problem of his bike is its loose quick release cramp of the seat post.
According to him, after three weeks in use, the cramp becomes loose and the saddle does not stay still.
He tried to fasten by rotating the screw of the cramp.
However, because there is little space between the screw and another screw which fixes the top tube, he could not insert a hex key in there to fasten the screw.
I confirmed this situation by myself and thought this is a serious problem about A-bike design.
The manual does not say anything about this issue.
How are you dealing with this problem?