Those kind of things are frustrating ... but great learning tools!
You'll never have that problem again!!
Just like on my DSM when I was having problems and could never understand. Would thread and re-thread top and bottom. Work fine and then ................. arrgghhhhhh
Turned out that the thread was sometimes catching in the little notch on the edge of the spool, and it would take a few revolutions before that happened each time.
I now mostly use Aurifil .... no notches, but at times there is a rough spot on the edge of the spool that the thread will catch on .....
They all keep our lives interesting!!