Brad says every time he tries to upload his photos to Google Photos, his Wi-Fi fails. Leo says that turning his Wi-Fi off and on could help as it renews the "lease" on the router with a new IP address. Something inside the Mac's network settings could be messed up, and renewing the lease can fix it.
It could also mean that the computer has lost contact with the router. He should reset his AirPort and update the firmware. That chatroom says it may be Google Photos that's causing the issue as well.