i had the same problem in my vy (v8 auto), after its first rebuild(under holden warranty) there was still a slight bit of flaring, i took it back bout 10-11 months later (under parts warranty and labour) and it turned out to be just a 1-2 shift solenoid valve, something small and nice and easy, so could start there, with replacing the shift solenoid, hope that helps, thats what mine was and it was doing the exact same thing.
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