According to your logs, your DNS isn't resolving. Try this: Go to Network>Interfaces>Lan>Advanced Settings>Use custom DNS servers and put in 208.67.222.222 then click the + and add the second one 208.67.220.220 then save and apply. I've seen it hang on the save and apply so if it does just reboot. Hopefully this will resolve it.
Also in your scheduled tasks delete the first one, you have duplicate entries.
Running the latest OpenWrt stable release