Why when using the ice cream maker with compressor sometimes it creates an iced layer on the bottom of the bowl?

As for ice cream machines the function COOLING is provided, therefore if the machine is left in this cycle for more than one minute it will begin to form a thin layer of ice on the bottom of the bowl. It is important to be careful when using the function COOLING, as the possible formation of ice could cause the machine malfunctioning due to the obstruction of blade rotation.