hmmmm....I can't think of any "good" reason for it to have multiple instances. Theoretically, the app should only have one data _connection_, but could spawn off new instances until it runs out of memory. Considering that it's singleton, it should only be able to use one instance at a time. Try creating your instance in a global scope and see if that helps. either that, or add a dispose to instance each time it's called. That will mark it for cleanup through the garbage collector. Either way should narrow that down to one active instance. Once that's done, I'd recommend scanning the app again for any other objects that are being handled in a similar fashion.
