General power of authority

It is better that you revoke the POA first and start operating yourself and then once you are sure you may give it back, but that may ruin your relations. 

If the POA has been registered, you will have to revoke it through writing in the same registration office. 

But if your money has been safely growing in his hands, you should not play with the relations. He might take it the wrong way and get biased against you. Though it depends on your personal relations.

Regards

Umesh Arora

(Supreme Court of India)

It all depends on such conditions/stipulations in POA document and whether it is specific for operations of Bank Account only or mentions some other obligations of investments etc.

You can simply issue a notice to the Bank and POA holder informing cancellation of POA and stoppage of transactions with immediate effect  and after one week you can continue to operate the account ignoring the POA given.