cv boot clamps that most japanese cars came with are sort of springy and have to be folded over to lock, european and american cars have very strong ones which require a special tool to crimp and lock into place. It looks like a nail pincer (remover - aka zamboor)
always use the correct CVJ grease nothing else works.
bad wheel alignment will cause the CVJ to fail because it has to work overtime, when you drive straight the whole assembly is sitting idle just going around, The CVJ only works when you turn the wheel.
If your car is raised from the front the CVJ will fail too same with bad camber.
in perfect resting position the wheel should be perfectly straight and the axle rod should be perfectly horizontal too