Hello tikibooboo Welcome to the Seven Forums!
The XP Mode has a form of sleep mode when left idle for any lengthy period of time much like being timed out from a server when simply leaving a browser window open to one page too long. This is what others have reported since I still to leave the XP Mode unattended for an extended period of time to see the various closing type messages appear.
Some information about this was discussed on an older thread here at SF with someone having a similar but not identical problem that could be a help. Windows XP Mode Questions