Think it was my mistake, it seems I was too tired... So guiding resumes directly after meridian flip, BUT the next image was taken 40 minutes later. The rms of the guiding was not the best that night, but directly after MF it was les than 1", after that a short spike to 1.7", and 10 minutes after MF stable below 1". So I don't understand, why the next exposure starts so late, 40 minutes after MF?

I have to check the settings. Maybe someone can tell me were to look first? The times for settling and so on are well below 40 minutes...

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