B-1, r. 3.1 - Code of Professional Conduct of Lawyers

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48. Unless it is at an inopportune time, a lawyer may, for serious reasons, cease acting for a client.
The following, in particular, constitute serious reasons:
(1)  when there is a loss of confidence between the lawyer and the client;
(2)  when the client has deceived the lawyer, failed to cooperate with the lawyer or acted without taking the lawyer’s advice into account;
(3)  when the client, after reasonable notice, refuses to pay disbursements and fees to the lawyer or a provision therefor; or
(4)  when the lawyer is in a situation of conflict of interest or in a context in which his professional independence could be called into question.
O.C. 129-2015, s. 48.