I use a thread net on the spool of thread when I see the thread coming off the spool in jerks or big spasms. I always use one on monopoly and metallic thread spools.
Two things happen when a thread net is used.
1. A teeny bit of top tension is added. So I may have to back off the top tension a smidge. On my Innova ling arm that is about a quarter turn of the top tension knob.
2. The thread comes off the spool more smoothly so the thread does not drape and get caught on a screw, get wrapped under the spool, come out of a hook or eye, or get caught on a fitting.