This is something that I have noticed has been happening lately to me, on different websites out there probably about 5 now, webpages I create on them that get indexed in Google shortly there after appear to be removed from Google. But then when I log into a Google account and manually submit the URL for indexing submission it usually instantly or soon after gets indexed back in Google when I search the URL. And this keeps happening to the same pages, sometimes the URL disappears in Google in just 1 day sometimes it's there for 5 days before it disappears. And again if I manually submit the URL it comes back. So what is the cause of this ? I don't want to have to keep submitting every webpage back every couple days. I should mention that these websites I'm creating pages on are not my own websites I'm talking about established domains like web2.0s sometimes.