[BioC] Problems with per package download statistics

[heyi xiao]

I notice that the per package download statistics pages are down for many (but not all) packages for quite a while. 
For instance, the few p letter packages: the first and second one have problems, but the third one is okay.
http://bioconductor.org/packages/stats/bioc/parody.html
http://bioconductor.org/packages/stats/bioc/pathifier.html
http://bioconductor.org/packages/stats/bioc/PathNet.html

this seems to occur ramdonly over many packages in this page http://bioconductor.org/packages/stats/