Mini-Hex maiden FPV with failsafe failure

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First part of the vid- loving this copter, so smooth and stable. Probably the best punch on a copter I had so far. Not draining batteries to the last I'm still getting 17-18min. of flight time:)
Second part of the vid and more important- WTF did just happened??? I set F/S to cut the power in event of signal loss, checked few times without props by switching off the radio, everything was working as it should. I even double checked after when back- yep, radio off = motors stop. And I'm left without understanding why da hell FC kept last PWM inputs instead of proceeding with set F/S.
There's a lot of anomalies in the field I'm flying- 2.4g for radio doesn't like there at all, had few F/S at only 100m and telemetry warning on Hawkeye UHF, but never lock out on me on UHF, neither lose the signal at around 30m. I'm pretty sure it's not antennae problem as I fly with Diamond on Tx and DIY monopoles on Rx's for quite a while now and having no problems with range, signal or anything whatsoever. Also noise floor was showing very little as well. I suppose to check what's it like in the field I have to bring my laptop next time.
Oh well, I have to find the answer (and another field for flying close by:) or at least a logical explanation coz I'm so horny to start bashing this hexa, but now getting paranoid over my signal:)
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