Linino Locks up after ~12-24 hours Running php Script every minute

Official Hardware Classic Yún
33 
config interface 'wan'
        option ifname 'eth1'
        option proto 'dhcp'
        option metric '10'

You are on dhcp. You could change it to static IP address.

config interface 'wan'
        option ifname 'eth1'
        option 'proto' 'static'
        option 'ipaddr' '192.168.0.239'
        option 'netmask' '255.255.255.0'
	option 'gateway' '192.168.0.1'
	option 'dns' '8.8.8.8'

Never use windows app to edit Linux config file, you must be comfortable to use vi (some time vi is only one available), after Linux box up online then you could install nano (very closed to notepad).