A/c not cooling at night

That just doesn't add up. When it's not cooling, have you tried shutting it down for a few minutes, then restarting?

Like alx said that doesn’t make sense. The only thing that I could think of is that it’s freezing up? Is the fan still blowing? It is that would tell you that it isn’t freezing

Is it mildly freezing up during the day?

What you are showing is quite a puzzle...and I don't see an easy answer to it all. I am almost sure that there is an issue (either malfunction or programming) with the control of the system. Meantime, you need to check day and night to see if the airflow across the coils changes. Also need to check day and night to be sure the large line on your outside unit is cold/sweaty and the small line is hot to the touch.

Another thing that I notice is that your system recognizes whether the particular rooms are occupied or not. You need to be sure that when the kids are going to sleep, the unit does not mistake the rooms for being unoccupied and shut down the cooling...some hotels are intentionally doing that nowadays.

It’s freezing up at night. During the day the heat prevents it from freezing. Check your pipes but your unit outside.

But this is from a freon leak. Get a leak detector. Hopefully you only have to replace the coils.