Well his health has gotten somewhat worse over the years, as has all us "Older" folks. But He was just married a few months ago, and has had a lot of computer issues and the like.
AS FAR AS I KNOW, he isn't sick to the point of it impacting his posting here. He also quite some time back had a big sell off of a lot of his blades.
Probably just life getting in the way of posting, which happens. I would be the same way to an extent if I didn't work the midnight shift. If you want,just send HD a PM letting him know you are concerned about his welfare. I do that a lot,matter of fact I just did that tonight for a couple dogs.