Well, there was another PR update today (noticed just today), & my previous PR4 that was dropped to PR3 went back to PR4. Was expecting the next update to be around the 27th - 30th of this month, but it came earlier apparently. So check your PRs.
"Google's unstable updates" ? well i hoe so. My site PR4 droped to PR2 last week. await for next update sad
Well I'm hoping I get to keep my PR4, it's been like that for years, was shocked when it dropped to PR3 last month but looks like they gave it back, hope they don't take it away again.
PR update is good to me.. I am so happy to see good results.... Well, I am hoping for a better PR soon..
Non of my pr changed but google is slightly changing the PR very often these days and doing some mass update in 3-4 months.
I monitor over 20 websites and have not see a PR update or anything of the sort in the last few days. Perhaps your website was just affected due to some link changes or something to that affect.