My friend bought a new 830. She had it in the shop more then she used it. It took weeks to get the new sensors and parts needed each time. She wanted a new one to replace it but was told the parts could be replaced so no new machine. She took a loss selling it before the warranty ran out. You couldn't melt and pour her in a Bernina shop now and her experience stopped many guild members from buying Bernina. The dealer should have given her a new one and would have gotten many more buyers. Guild members stick together. One is burned, they all back off.
Oh she did contact Bernina Headquarters. Always got the same response. Go to dealer.