Hi and welcome to QB!
I have a few different machines including a Juki HZL-400, and I have the same issue as you on all of them if I don't pull up the bobbin thread and or use a lil scrap of fabric at the beginning of sewing.
My Juki is fairly new, but so far I love how it sews! Honestly except for the 11" bed on my Janome Horizon 7700, I actually prefer my Juki. I just got a Bernina, and am excited to see how it sews.
Your title of "Operator Error" had me chuckling, as I've had that issue a few times
Kif