There is some confusion because Bernina re-used number series. Do you have the (old) 830 Record or the (new) computerized 830 Embroidery?? The modern computerized 820/830 did not go over well with the public. My 820 (same body but no embroidery) had to have the thread sensor replaced and has always been rather fussy with the thread.
The old 830s are generally felt to be very reliable machines.