In both 15.0 and 15.1 I've seen 4 or 5 unidentified, CPU intensive, long lasting jobs appear in KDE notifications. They also seem to access the disk fairly intensively at least by the sound of it. I am unable to identify them in System Activity. They show up after I've edited Excel files in LibreOffice and have copied the format from one large spreadsheet to others several times. At the same time I have used another application (SAS) to write large Excel files. These jobs persist after LibreOffice is closed and after SAS is finished writing its files. I can kill these jobs with no apparent effect. Is this some weird interaction between these programs and is there a way to stop them?