The first problem almost sounds like the start button is staying pressed in for longer then it should and it might be adding players before it actually returns to its start position, thats a long shot tho! , i own the machine and have never had that problem so id just start with taking that button and mounting hardware apart and clean around it and even the connections at the switch itself! For your second question im really not sure! Run some of the tests on the machine see what comes up and post the results from the tests here!