Originally Posted by
mary quilting
dust out the bobbin case might help
This was going to be my suggestion as well. My brother also has a warning notice that pops up on the screen when my bobbin is low. Of course it usually pops up when my bobbin is still half full, so I have to constantly be checking so the same doesn't happen to me. When the fuzz and lint really starts building up inside my bobbin case area, my bobbin indicator stops working all together and I know it's time to get my machine serviced.
I now know to brush out my bobbin case area with every bobbin change so that it doesn't build up so badly.