No, I do mean system update.. I know it seems unlikely, but sweeping GBA in this two recent discussion (this thread and
https://gbatemp.net/threads/controller-analog-stick-moving-by-itself-but-not-joy-con-drift.610413/) we are now complaining about a different kind of drift.
I already had drifting joycon in the past but never of these kind. It was always a matter of inaccurate positioning, the calibration was always showing a trembling movement. Here nothing is happening when I try to calibrate, everything seems fine. I get back in the menu and the analogue start to move all way right. In some games I have no problem at all (metroid) while in Breath of the wild I have some phantom movement...