This is a bit vague, but you may already know what I am talking about after reading the below.
Sometimes after a time of not doing anything on the intranet, I press an item on the left navigator. I get the list of documents for that item. When I press on one of them, all I get is the waiting image and no information comes across. Same if I press a tag to filter the list.
press an item on the left navigator and get the list of content - wiki for example
press a tag, get nothing but the wait image
press private messages and get a list.
press the document and get nothing but the waiting image
but if I press startpage link, then press the left navigator, get the list of items. I am able to press a tag to get the filtered list. I can go into the document