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The most common problem for this concern is
may have overdrive band or intermediate band failures due to servo pin case bore wear causing reduced apply pressure.
Unfortunately to repair this is going to require some major work on your trans. You will need to remove your trans and preform some modifications to the trans it does not happen again and require an overhaul or rebuild and the overdrive band or intermediate band have excessive wear or burned/damaged band friction material, the cause excessive servo pin case bore wear.
does this require a trans rebuild to fix?
the trans does have over 230k on it
Unfortunately it is going to require a overhaul or replacement.
do you have any other questions on your concern?
not at this time...thank you