HP15C LE Bad Button Presses

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I bought 3 HP 15C Limited Editions new back when they were available in 2012. Over the years, all three have been developing a problem with registering spurious button presses.

What happens is I will press a button one time, but it will register two or even three times. If this is a number I can sometimes notice and correct, but if it is an operator it really mess up my whole calculation. It's very tedious.

It seems likely to happen with any button, perhaps 1 out of every 100 presses. It's just now getting bad enough that I can't really use these anymore.

Because it's happening on all three calculators, I assume others have the same issue. However, I did a search and couldn't really find anything. Am I alone? Any ideas?