The U.S. Attorney's office is making a rare attempt to delay civil lawsuits against Starkey Hearing Technologies, telling a Minnesota state court that the suits against the hearing-aid maker could jeopardize a separate criminal investigation. The Star Tribune reports on the filings by U.S. Attorney Andrew Luger, which seek to halt discovery in lawsuits by former Starkey Chief Operating Officer Keith Guggenberger and former executive assistant Julie Miller, who both lost their jobs as part of a front-office…