I don't know if this is a bug yet. I didn't have any problems with musical chairs UNTIL I got the Faster Eater perk. Almost immediately they started to eat faster, and they would stand up as soon as their food arrived, wander over to different diners and even leave the restaurant with their food untouched. This is with 5 star customers. I guess they left good reviews so I can't complain, but I want my customers to enjoy their meals. I may go back to an earlier save and not get the Faster Eater perk.