I’m having an issue with the coin cup cycling halfway and stopping. The next customer then inserts coins which bounce off the bottom of the cup and back out of the machine. The product drops, but the coin cup is empty. (Since they bounced off the cup) The cup then spins halfway again to the starting position. This machine is from 2004 and still has the old style board. Is the motor going out or possibly the board? Thanks for any suggestions.