My PR is 3 in the morning then changes to 0 in the afternoon. This has been happening over the last few days. Does anyone know why this is happening?
Can we ge the url? PR just doesn't change like that. The google tool bar is still updating a little so thats probaly why you had a pr3 then a pr0.
You don't need the URL to answer this. Google toolbar is updating - never heard that before. Google is going through a PR update. Some G datacenters (DC) have new infrastructure and those DCs are reflecting new PR. The DCs with older infrastructure will take another month or two to catch up. You as of now have PR3 - but why are you so worried about PR in first place?
High PR does not necessarily translate to high ranks. All you need is quality BLs that too in large number.
Google is updating PRs atm so it might be a bit buggy as they have millions of sites to re-index, be patient and you will see your new PR after they finish updating.
G is still updateing PR, I'm still noticing some movements on some datacenters, so nothing surprising