I bought one a while back and I want to like it, but it's always turning off right when I need it. The sliding switch on the side needs more resistance. I bump

I bought one a while back and I want to like it, but it's always turning off right when I need it. The sliding switch on the side needs more resistance. I bump it accidentally, or it slides itself. Could be some user error involved. There's a lot to like about it, otherwise.