Check your route:
route outside 0.0.0.0 0.0.0.0 24.213.252.70
That is the same IP as your public interface:
interface Vlan2
nameif outside
security-level 0
ip address 24.213.252.70 255.255.255.252
It should be:
route outside 0.0.0.0 0.0.0.0 24.213.252.?? This is your default GW when you have the PC connected.