seems peer bootstrap node is down. new users may have problems to connect to network for first time. also all nodes are not connected as well as they used to be so it may cause temporarychain forks and in result oraphan blocks. please post your node address. hopefully this will help to keep network properly connected. i think increasing "ideal peers" numer may also help.
mine is 18.104.22.168:30303 you can use "connect to peer" button to add it.