Livemail folder items disappear and become storage folders or recovered items

Hi all

Every three weeks or so the items from my main folders in Livemail disappear and the following happens;  The inbox items return individually over about two minutes, the sent items empties completely and the items reappear in another sent items folder under a storage folders, recovered items heading.  I have about twenty five replicated folders each with a date heading such as 11-20-2014.  Any sub folders from the main items at the top appear haphazardly down at the bottom and a split into recoverd dates.  Most annoying, and I have lost some items altogether.  Any idea what is the problem and how to rectify?

Thanks

Phil