If, following the submission of a claim under this Section, the investor fails to take any steps in the proceeding during 180 consecutive days or such periods as the disputing parties may agree, the investor is deemed to have withdrawn its claim and to have discontinued the proceeding. The Tribunal shall, at the request of the respondent, and after notice to the disputing parties, in an order take note of the discontinuance. After the order has been rendered the authority of the Tribunal shall lapse.