HSM (randomly) arming with contact sensors open

Just playing with HSM and 2 new contact sensors (compatible Sengleds). All was good this morning, with the HSM alerting that the sensor(s) are open. This afternoon, the HSM arms, but with the sensor(s) open. I have not bypassed them.

This seems to be a random issue. With HSM sometimes arming (incorrectly) and sometime failing to arm (correctly)

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