Mine was doing basically the same thing. At first I was needing to wiggle the switch a bit. It was almost as if the actual tact switch had shifted a tad out of plumb/level (however you want to look at it). I cut a small circle of thinnish cardboard and put it on top of the tact switch (well, actually below/inside the big plastic switch). It's as if it lengthened one or the other, gave them better contact, and allowed it to work better.