Check your internet router... maybe it had a firmware update that keeps misinterpreting your sprite system as an intrusive object or malicious spam etc.. happened to me on my norton core router. I  had to go into my routers apps and manually allow the connection. It turned out the constant weather updates caused the router to think it was spam. 

Go to the calendar select the day then it should ask if you want to skip that selected scheduled watering day

Keep an eye on your restrictions for your city under settings. They can cause you to miss more watering days. Example of this is if it’s scheduled to rain the day before your city restricts watering or if they have set watering days for your address you may end up missing the day you should be able to water due to the restriction