No delay or omission to exercise any right or power accruing upon any default, omission, or failure of performance hereunder shall impair any right or power or shall be construed to be a waiver thereof, but any such right and power may be exercised from time to time and as often as may be deemed expedient. No waiver, amendment, release, or modification of this Agreement shall be established by conduct, custom, or course of dealing and all waivers must be in writing and signed by the waiving party.