When referring to Berninas - it is helpful to mention approximatlely what year it was made.
Some Bernina model history:
https://sewingiscool.com/bernina-models-history/
For reasons unknown to me, Bernina got the idea to number some of their new, super-duper, fancy/finicky machines with the same model numbers that were used 30-60 years ago. Many of those older machines are still working well.
So - when someone says I loooooove my Bernina 830 - which one? The basically mechanical one - from what I understand is relatively fuss-free
or the "new" computerized Bernina 830 - from what I understand has been a "problem child" -