fix issue #605: I'm adding a couple of tricks in order to work around… (#747)

* fix issue #605: I'm adding a couple of tricks in order to wark arounf the problem. First a 2 seconds delay has been added befre clearing the trigger after the detection. Secondly a mode reconfiguration has been forced after the event is cleared.
thepower failure event detection and the

* fix issue #605: fixed and issue showed by reviewer, the power fail detection should be reset after a recover procedure is done.