Crunching into reverse when hot

As per the title, 2006 Exige S - cant select reverse once its hot. I’ve changed the slave cylinder, but that hasn’t made any difference. Any ideas? Worth changing the gearbox oil? Any thoughts / ideas greatfully received.
Thanks.

Cable can stretch a little when they get warm, might be worth adjusting first or replacing if it’s old and worn .

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How do you adjust the. Cables?