I got this from Elektron:
" The analog tracks will always need their components to be warmed up to working temperature to provide the best results in terms of tuning and filter responses. But even though that is the case, we also have functionality in place to try to compensate for it as good as possible during the warm-up phase, and we also have manual calibrations that can be executed if needed. But some variations will always exist, and the first initial minutes will have the biggest variance.
Recently, we have seen occasional reports where oscillators have been slightly more off than expected (especially on low frequencies and certain notes have been more problematic than others). We have now started working on improving the calibration routine and hope to be able to include the improvements in the next OS update. Let me know if you have any questions."