To date, after a reset, the loss of network with 'out of range' error happens a minimum of twice a day. Sometimes 'forgetting' your Wi-Fi network and reconnecting can resolve the issue. Give everything a minute or so to shut down completely, then turn the router back on. Mine does the same thing.
But 100% of the time when I come in the next day it will no longer connect unless I forget the connection and recreate it. Some common issues that people have been asking about are: Wi-Fi issues after upgrading their phone. As mentioned in one of the comments a wireless modem/router may have multiple connection methods. Find out more Don’t forget to forget!
Sometimes when a phone remembers a network it remembers an incorrect password for that network and can cause problems.