Shelly Plus 1 and reed sensor

I have a reed sensor connected to a plus 1 and addon. Since firmware 1.7.1. Shelly doesn't read the changed state of the sensor, for example when quickly opening or closing the door. When restarting the Shelly the correct value is shown again. Any way of fixing this? On the 1.7.4 beta it still doesn't work. Can I downgrade to 1.6.2?