It shouldnt blow off, the turbo outlet has its edge raised, as does the piping. I'd say theres some oil residue from the turbo in there that's worked it way in between the alloy and silicon joiner. Take it all off, degrease all the surfaces, totally clean & degrease the silicon joiner, and refit with a new clamp, and do up tight. One problem is that these turbo blow oil, and it will seep into the joins while the car sits, and with that join being closest to the turbo, and hanging straight down, its the first place the oil will sit. Just make sure all surfaces are free from grease... if its been popping off alot Id say it greasy inside.