no clue my friend and to tell you the truth i have tested the machine maybe for 40 rounds, verifying the intervals, etc
i can only assume some circuitry is causing the shutdown (or stop perhaps), given that it has a coaxial connection for the remote control (I assume) maybe something there is malfunctioning and triggering a stop/off - I am full ignorant on this, but now i am intrigue so i will try to do some research and see if i can help