Transmission problem

First it started with slow engaging when shifting from forward to reverse and back.
Next, when the fluid was checked it had foam.
Then, within a few miles it kept downshifting from overdrive and back.
Then while checking the fluid level it was over full and then it started coming up out of the dip stick tube.
The fluid is now turning dark.
What is causing this problem?
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have you checked it when it's cold ?
sounds like its low and is sucking air and foaming
even if 'full', the filter neck or seal could be leaking

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