You can amend or revoke a durable power of attorney in any way you see fit, including removing a poorly performing agent. It is usually best practice to revoke the durable power of attorney and create a new one appointing another agent. In any case, you should serve the agent with a notice of revocation and inform all organizations that have relied upon your durable power of attorney of the changes you have made. If you are unhappy with how your agent is handling your affairs, then it is better to withdraw your authorization as soon as possible.
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