No issue on my late non-Recaro "Recaros".

This happens on a lot of seats that adjust with a rotary knob rather than a ratchet and lever, on the rotary type, the knob is prevented from turning without any force (i.e a hand) by a wavey washer and when this washer weakens with age the backrest can work its way back by vibration allowing the geared knob to turn.

Hope that makes sense

The cure is a new, stronger wavey washer.

Any chance of you doing a how to MrT?

I looked into this a while back and did not come up with any decent conclusion. Recaro were not helpful.

TrimDeluxe offered to have a look, but in the end I did not make the trip down there.

Weirdly mine only do this for a short while, then it stops and maybe a couple of months later comes back again...

I should be able to, I'm taking the seats out to sell in a few weeks time so I could do one then.

You would make many people very happy T!