The Easy A actress's management cut ties with Bynes near the same time as her car was impounded following a drink driving arrest and a series of alleged hit-and-run incidents, reports TMZ.
Bynes's break with her professional handlers reportedly occurred when she stopped taking their calls or returning any messages.
Sources close to the star told the website that Bynes simply felt she no longer needed a management since she has retired from acting.
Bynes has not commented on this latest report.
The What a Girl Wants actress did issue a public comment on Thursday (September 20), assuring her fans that her personal problems have been overblown in the press.
"I am doing amazing," Bynes stressed, later adding: "I am not talking about being arrested for DUI because I don't drink, and I don't drink and drive. It is all false."
Watch a What a Girl Wants trailer below: