Newbie here with a problem and looking for guidance/suggestions. Periodically at startup I have to launch a couple of balls without a ball count starting and I just have to let them fall through the playfield without anything working until it launches into ball 1 and I can start the game. Another issue, which I assume is related, where the ball count remains the same and doesn't advance after kicking the ball back into the shooter lane, it advances with manual pressure but I can't seem to set the prong or contacts correctly to do automatically. I tried cleaning the contacts and sanding lightly with 600 grit but that just added to the problems where the right flipper seems to seize up in the upright position when I manually press the prong to advance the ball. There also seems to be multiple efforts to kick the ball through every time and I don't know if that's typical. I don't know anything really. Total amateur looking for some guidance. I've included a 2 minute video here if anybody wants to offer some advice. Thank you much!
<iframe width="560" height="315" src="https://www.youtube.com/embed/uOqjkyncFkM" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>