sitecore7 - Sitecore 7.2 - Bucket Items getting unpublished automatically -

i have installation of sitecore 7.2 running on asp.net mvc.

my issue have converted 1 of pages item bucket.

i create bunch of bucketable items (posts/pages) underneath , publish.

they show fine after publishing, after period of time or so.... these bucketable items automatically unpublished , deleted "web" database.

i don't know process unpublishing these items, , it's driving me insane. parent bucket still there items in master database in unpublished state.

when "in unpublished state", mean not in final approval state of workflow? items cannot publish unless have version in final approval state.

(if not meant, apologize)

automated publishing can occur number of ways, may want check /sitecore/admin/showconfig.aspx see if scheduled publish agent configured run. you'll see interval configured run at. explain why changes happen in web database without triggering manual publish. can check log files see if publish agent running.

finally, check publishing change restrictions see if bucketed items have 'end dates' specified item or version. these cause item unpublishable. should see warning in content editor effect if version cannot published.