Reduck
Because I can....
Without having a Dos myself, this is all just speculation, but it sounds to me like you might have gotten some faulty tubing - assuming there are no bubbles in your reservoir bottles. Doesn't happen often at all, but we have occasionally seen sets for our IV pumps have a tiny hole that leads to air in the lines. The pumps we use can detect those bubbles and shut themselves down.
Only time will tell. I had some airline so I replaced it all. I like the ddr design but didn't give thought to drips. For what the whole system costs, I think more details like that should have been considered. Especially considering these tanks are usually front and center in our homes...
It hasn't missed a dose other than due to my clumsy programming.
We shall see what happens in the next day or two...