This may not be the same thing, but my Logitech M510's always crapped out in just this way after about six months. Supposedly the fix is to adjust the spring inside the switch. I'm not a mechanical genius but I can follow instructions, but for me the adjustment never worked. I don't know about Wow Joy Pen but for the M510 a number of users--apparently a minority, though a sizable one--had the same experience. I think the root problem is that, for my model, the manufacturer settled for a "good enough" switch rather than a switch chosen specifically for its durability. I don't know why keyboard switches can be so dependable but mouse switches so often are not.