whenever get a new to me ASTEROIDS (well now its every game i get), i replace every electrolytic capacitor i can lay my hands on.
while all that is out, laying on my static free mat, i reflow all the cold solder joints i can find. then i test and see whats what (sometimes HERE i get into replacing transistors, resistors, etc. if they look like they got hot and test bad and cooked the PCB)
that giant big blue capacitor there on the bottom, when they go bad, can cause all kinds of screwy problems. it needs to be changed anyway so i dont get mad if that doesnt fix the current problem.