The waiver by the Tribe of, or the failure of the Tribe to take action with respect to, any breach of any term, covenant, condition, provision, restriction, or reservation herein contained shall not be deemed to be a waiver of such term, covenant, condition, provision, restriction, or reservation or subsequent breach of same, or of any other term, covenant, condition, provision, restriction, or reservation herein contained. The Tribe may grant a waiver of any term of this Lease, but such must be in writing and signed by the Tribe before being effective.