I have exactly the same problem I am going to approach the central screw tension in the underside of the Touch I/D sensor securing plate as a first step.
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Costadelsol
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=== Update (12/03/2017) ===
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Hi
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There does not seem to be a definite answer to this problem I finished up dismantling the Home button on the clients phone and re-assembling it extremely carefully, to my amazement the home button took a harder press for activation, the over sensitivity problem had gone so I an still in a quandary why the situation occurred in the first instance.
Hi Victor
I have exactly the same problem I am going to approach the central screw tension in the underside of the Touch I/D sensor securing plate as a first step.
Costadelsol