Which pipe is it?
Standard or FMIC?
Pic?
If it's not a ridged pipe, then it will always occur.
If it IS a ridged pipe, then some stronger Mikalor clamps should be bought
That'll be why it keeps popping off dude.
No matter how strong the clip you fit, this will always keep occuring.
Remove the pipe entirely, and have a ridge welded around the end, and your problems shall hopefully cease!
could try a bit of hairspray.