Originally Posted by
boovish It's been nearly half a year, so I think it isn't too early
If the button was susceptible to usage degradation, there would be a wide spread report of the same issue...as there are always people who use a button more than you yourself do. Combine that with the fact that yes, as kataran said, 5 months isn't anywhere NEAR long enough to wear out a button on these devices unless the button itself is faulty in some way.
You have a unique issue with your device...it's advisable you have Apple replace it for you because it will probably only get worse if it's already wearing in like you described.