Hi, a quick update from me. Duet replaced my sensor (kudos to @Roland, the swap was quick and flawless, even if I live in Singapore).
I have been using the new sensor for several weeks now, and it has saved many prints, and potentially more disastrous situations. The sensor never paused the printer without a valid reason: clogged nozzle, empty spool, and once the spool even fell to the floor.
Great tool, highly recommended.