that machine is also called nurse betty,

when you are in jackpot or fever mode you have to keep getting balls in the jackpot pocket for round to continue.

so if you don't get enough in the pocket it goes into error mode.

i have 2,000 balls for mine, so i can keep up with it now.

i kept having that happen to me when i didn't have enough balls to keep going in fever mode.

it's a fun machine :lol: :lol: :lol: