I just bought a Babylock Destiny2 yesterday. I bought a BlJourney 1 1/2 years ago. It was fine for a while, but then started pulling the bobbin thread up, or the top thread down, and thread nests galore. I took it to the shop 6 times since May, replaced the bobbin case two times, and spent hours at the shop with the gal there and stitched designs out on my machine so she could help me figure it out. We never could. If I hear the phrase "owner error" one more time in my life from the shop, I'll go beserk.
Anyhow, I couldn't use a machine that didn't work, so I just traded it in for a new one. I tried it out and it works perfectly. While my solution is not the one I preferred, I'm happy with it.
The moral of this story is that just because the shop can't fix a problem, that doesn't mean that the problem doesn't exist.
Enjoy your new machine!
I bought a different brand to replace it. As another fault the machine had, I found out by doing a craft show class, was something all that brand did. Which was another thing the store I bought the machine from blamed me for.
Good luck with your new machine and may all your sewing be much happier.