Inkscape keeps running in background even though programme closed

Several times now when I have closed down Inkscape the programme still keeps running in the background. There is no obvious evidence of this on the desktop however the laptop sounds as though it's working hard.

On investigating the Task Manager I find that Inkscape is still running and using up loads of Memory. It shows up in the Process tab. It doesn't happen all the time.

When I hear the laptop working hard I remember that this may be the cause so I go to Task Manager and stop the process.

When I close down a file that I'm working on I expect the programme to close and not run in the background!

Using: Windows 8.1
Inkscape Vers .92
Using a mouse (and not graphics tablet)

I've posted in the Inkscape Forum and Brynn suggested I post in here. Thanks.

Caroline
PS. Not a technical person and not an Inkscape super-user :)