We are having this same issue. I have replaced the sensor with the new one. I have updated the firmware. I have tried bending the metal piece. It worked for a while and now has come back. I ordered a new metal plate and installed. This did not work. I have put the bent plate back in the machine with it bent at several different angles. Still not working. At best I can get one booklet to print.
This sensor gets its reading from the black fold roller. Have you tried cleaning this roller with soapy water really well. The roller will get a grey haze, and can cause the sensor not to read well all the time. Hope this helps
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