It sounds like what I’ve read on the net before. Change the gearbox oil when it’s playing up and you risk making it worse as you’re possibly taking out the “thicker” bits from the areas that are holding it together. I would imagine it’s rebuild time but if you haven’t already I would be trying reset the adaptations just to check.
Rebuilds come in two flavours from what I gather.
Full rebuild job jobbed with warranty
Cheaper alternative is to try and replace the valve body or the TC to see if this resolves the issue. But then this is all on you with no guarantee.
At 95k miles I would say it’s still financially viable to rebuild.
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