Why does the “bad stuff” always happen on the weekends?

Does it seem to anyone else as though the “bad stuff” always happens on the weekends? Mom & Dad are together in assisted living, she with AD and an ileostomy, and he with his own, slightly milder dementia (probably vascular given his extensive cardio-vascular disease). It seems as though Mom’s bad AD days, their arguments, her bad ostomy days, and their “decisions” to live apart, always happen on the weekends. My theory is that the staff who know them best are off on the weekends, and the meals are generally not as good on the weekends (this part I know to be true), so maybe between being frustrated over meals, and not having the regular staff, Mom’s anxiety goes up and Dad’s patience goes down. It’s just getting harder to know how to get them settled (they are in PA and I am in AZ, so a quick visit is out of the question). I know there really isn’t a solution, it’s the nature of their respective diseases. I just wonder if it is just my imagination that things tend to go wrong on the weekends, or if others have the same experience. Thanks in advance for any sharing. Sending you all love and good thoughts for strength and peace.