Sonic Care toothbrush

One Concern I have with the high end toothbrush is that the small metal point that you snap the toothbrush on after awhile comes out. It is impossible to re-insert and therefore I have to throw the entire unit out.
Is this normal wear and tear?
I have had this one for a year.
The High cost of the Sonicare would make me think that it should last longer.
When reading the information I did not come across this problem.
Hope you can help me out.

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