During the summer thunderstorm season the antenna may be disconnected from the SDR to protect it. If the storm occurs late at night it will remain disconnected until the next morning. Check out this lightning map if you want to see what is going on in the area.
For your wintertime listening pleasure, the session timeouts and maximum daily times have been increased. On receivers 1, 2, and 3 there is a 3 hour per session timeout and a 10 hour per day maximum per person. On receiver 4 there is a 6 hours per session timeout and a 18 hour per day maximum per person. Timeouts are instituted to make sure that inactive sessions don't tie up a receiver and prevent others from using it. If your session times out you can reconnect up to the daily maximum. https://n1nte.blogspot.com/p/online-kiwisdr-receivers.html