It seems to be happening when the system goes into hibernation.
Hibernation is a state of inactivity/sleep mode. EG: When your downloading a file, and you put it your PC in hibernation, the network adapter and the hard drive are put in a power off mode (So your DL stops). I don’t know if this is a CFP bug or some what, But this might be the reason why CFP 3 turns off.
So have you tried disabling hibernation? What happens then?