keeping staff happy is hard

I am doing fine with my business after about 2-3 sims weeks, my employers are all satifisfied, very satisfied, or neutral. My biggest problem is that my waiters keep peeing themselves! How do I fix this? They will go to the bathroom maybe once during their shift (8-10 hours), and I noticed they usually pee themselves when they should have either already taken one bathroom break, or when they’d be due for a second bathroom break. Any idea how that works? It’s only my waitresses, both male and female. I’ve tried switching doors on the bathroom from male or female, to unisex, then to no sex, now back to a male or female door. I have 4 bathrooms. I had it set up with two sinks that led to two stalls, one each for the male and female bathroom. I deleted those because I noticed one day the two female waitresses wouldn’t go to the bathroom through the door once in the main bathroom area with sinks. I made sure all my dining tables, kitchen, and bathroom is on the same floor and close by. I don’t know what to do.