If it is popping off from machine side, the outlet thread could be damaged. This both on the machine and on the hose.
If it is popping out at the gun end, there must be a clip that holds it in place missing. This I am assuming that you have the right hose for the right machine. Using hoses not intended, will cause a lot of problems. Even actual hoses, they never should be modified.
Regards.
MG.
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