I've had it happen also and mine was the little L-shaped piece that operates the micro switch had popped over too far and would cause it be pressing the switch almost to the point of activation making bumps and just looking at it cross eyed causing it to open

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course