Hey Everyone! I'm super new to these Pachinko slot machines so I'm gonna need some help..

I recently purchased a couple of these Pachinko slot machines for my family to enjoy but one of them is being funky...About 90% of the time the middle reel stops and the alarm goes off. The only way I can get the alarm to stop and the middle reel to move is to hit the red reset button. I've tried cleaning the reel board and re-seating every connection in this thing but nothing helps. I've uploaded a video for you to watch which I'm hoping will make this a lot easier to understand...

If anyone can point me in the right direction on how to fix this or what part to replace I would greatly appreciate it. Let me know if you need any other details.

Thanks

https://youtu.be/TptEPHU_jWk