Disappearing internal pages - were well ranked

[man in poland]

Interesting / worrying one here. On a well-ranked, solid site of mine (PR6 front page) a couple of internal pages have disappeared entirely from the Google index, and the PR of the pages (previously PR5) have gone to zero. I am accustomed to Google occasionally missing the odd lower-level page or two, but never important pages such as these in my site, which are part of my main navigation and well linked into.

I thought about the old hijack scenario, but when I paste a snippet of these pages into Google, I can see nothing which might be a threat, or in any way a copy.

I'm hoping that when the index is refreshed, theu will pop back, but at the same time concerned that this might spread.

When I paste the url of the pages directly into Google, I get the old:

Your search - http://www.example.com/widgets.php - did not match any documents.

The page is not banned in robots.txt or anything along those lines.

What are the next steps I can take? Is it possible for someone else to have removed these urls from the index without my knowledge? Or should I just have a beer and enjoy the weekend like normal people?

All suggestions or advice greatly appreciated.

[edited by: tedster at 5:26 pm (utc) on Feb. 22, 2008]
[edit reason] switch to example.com - it can never be owned [/edit]

[wheel]

I wouldn't do anything or even worry about something symptomatic that's been around less than a week. if it's only been happening for less time then that it's likely just data center idiosyncracies that are self correcting.

I've had the odd AAAAAAH! moment too, but leave it perc for a few days and things tend to revert to normal.

[man in poland]

Thanks wheel - that's re-assuring! I have to confess that in 5 years this is the first time this has happened to me on such solid pages, so forgive my concern. I'll give it another week or so to see if they pop back, and report here either way.