I had another issue with my filament detector today. After it detected no filament, even with filament going through it, I noticed that when I pushed on the connector the blue light came on and went off when I released it. I removed the detector. It was very loose. I opened it up and noticed there was a fair amount of room for the circuit board to move around. I reassembled it. I applied pressure on the connector while I reinstalled the sensor. This moved the board closer to the switch. It has worked well all day now.