[aiharkness]

I don't know of an explanation why it would get better with use but then come back after the keys haven't been used for a while, but if you've ruled evertying thing else out and it's repeatable then there's no arguing about the fact of it.

I don't suppose the device is under warranty, is it?

What about a trustworthy repair shop in your area?

There's online, too. Check the sponsors of the forum if you decide to go that route.