Why does the toilet spray water for no reason

First of all, it is necessary to see which floor you live on, the lower floor is more likely to spray water, after all, the pipes from top to bottom, eventually converge below, if there are too many people using the toilet upstairs, the pipes will not be able to handle such a large flow temporarily, it will cause a temporary blockage, so that the water is back. Of course, if this happens on the high floor, it means that there is a problem with your own pipe, maybe other places are blocked in the sewer, and the probability may be relatively small.

Finally, consider whether the pipe itself is blocked by foreign objects.