Battery issue

Longtime follower, first time poster.
Does anyone know how to fix this?
I’ve been to my dealer and they’ve run ‘the battery’ test and say there is nothing wrong. Primary/starter battery a little lower on voltage (12.5v), leisure battery 13.2v.
Within 10 secs of turning the ignition off but leaving the keys in everything shuts off. Radio, interior lights, power windows, in fact any power in the van.
They claim nothing is wrong. I claim there is because it never did it for the first 18 months of having it.
Cheers all.

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