The Minnesota Durable Power of Attorney Form is used to ensure the Attorney-in-Fact maintains their power to act on behalf of the Principal, even if the Principal is declared incapable of making their own decisions. These agreements are usually Springing and will thus only take effect once the Principal has already been incapacitated.
In general, a Durable Power of Attorney Form is extremely difficult to terminate. It will obviously become void if the Principal revokes it or if the Attorney-in-Fact is no longer capable of acting for the Principal. It should also be noted that, under Minnesota state law, if the Principal and the Attorney-in-Fact are spouses and they get a divorce, the agreement will automatically be void.