Most programs are designed to drop to 0 during a pre-set rest period before ramping back up to the last mA that you set. Think of it like doing curls at the gym. You lift the bar up then you drop it down. There is a description of each program in your user guide that outlines how long the work time is and how long the rest time is for each program. If, however, you mean that the unit is actually turning off with the screen going blank then please contact customer service for assistance.
Most programs are designed to drop to 0 during a pre-set rest period before ramping back up to the last mA that you set. Think of it like doing curls at the gym. You lift the bar up then you drop it down. There is a description of each program in your user guide that outlines how long the work time is and how long the rest time is for each program. If, however, you mean that the unit is actually turning off with the screen going blank then please contact customer service for assistance.