Don't you just hate when that happens? I sew mostly with my Pfaff and a low bobbin warning pops up on the monitor. Only time it doesn' t do that is when I'm using prewound bobbins, think the cardboard bobbin isn't heavy enough to register. I have anaold Brother that I usually use at Pillowcase Sew Ins, no warning notice but when I use a metal bobbin I do hear it rattle a little close to the end. Problem is when I use a plastic bobbin it don't seem to do this and also this machine makes a bit more noise and I don't always hear it. May in Jersey