Live office objects loses connection with server

Issue : Creating new query in live office XIR2 and saving excel file.

After reopening live office document the inserted objects is not recognized as Live office objects .

While going to live office properties error occurs "Live office objects properties cannot be shown because there are no objects in current location"

same newly created query work fine fro 2 days and again same error occurs.

Waiting for your inputs

Thanks

Regards,

Ketki Fadnavis