I love the Shelly devices I have, the Shelly 1, Shelly 1PM and Shelly Dimmers but have had mixed success with the Shelly Door/Window Sensor so I was interested in a thread on the Shelly Facebook page today.
A user was having the same problem as myself of Open and Close not triggering to the point that I had decided it was not reliable to use.
Another user suggested turning the magnet through 90 degrees and to his amazment it worked for him, I tried it and also it worked for me as well.
His instructions were:
First, open the magnet plastic box prudently :
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Second; strip the foam adhesive, turn the magnet on its main axis, then replace it and past the adhesive foam on its new top. You can see that it can be replaced "correctly" and the small 2 hooks now don't fix it very well. But, as the foam will push it in place until the cover placed, it's not a problem.
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The magnet seems to be higher than previously due to this rotation. Now, the magnetic field beam is just in the correct direction to activate the REED relay .
No more false Close/Open state.
I really think that MQTT is going to be the way forward, local control and a large base of devices.