The 5.8 signal is the weakest link in the chain, easiest to block, and has the shortest range. The WiFi segment of it has even shorter range. Consider how far you can use your home's router WiFi signal and how it may be weak at different places in your home. It's for those reason the video starts to break up before the RC signal is lost, something all that fly using WiFi for signal transmission should always remember. The video signal is your early warning system. If the video starts getting flaky it's time to come home. For those that experience a fly away at short range, as one of mine did, we might consider that when compass and GPS both fail there could be other electronic signal conflicts occurring within the system that prevent the system from executing a signal trace back to the controller. I'm not a radio technician and don't understand all that could be involved but for those that experienced a true fly away and did all that was possible to prevent progression of the event I'm sure they've thought long and hard about what they could have done differently to interrupt the action to regain control. They may have recognized there is more to what takes place than a pair of components that are not necessary to fly the aircraft using basic functions experiencing a temporary failure.
Under "normal" circumstances, when losing signal the H will most definitely fly itself to the last known position of the flight controller. Before doing so it will rise to the programmed RTL height if below it, or remain at a higher altitude than the RTL height if above it. Once arriving at the last known controller location it will stop and hover and wait to regain signal. If it does not regain signal it will run out the battery to the auto land trigger point and land. It's been awhile so I don't remember at what point it lowers the gear if it had been raised but it will lower the gear automatically. Many of us have tested this safety function and know it to be true. A true "fly away" is anything but a "normal" situation. and it's a condition that every brand of consumer level multirotors can experience.
Where the H is concerned, there haven't been as many true fly away's as some have reported them. If we review the telemetry from them we see there have been a few fly away's but a larger number that were "flown away" by the user due to inexperience and lack of flight control skills.
People often refuse to admit they made a mistake that cost them over a thousand $$, it's all about their money at that point, so they make a warranty claim using fly away as probable cause in order to be provided a new aircraft as a free replacement. Quite a few believe they can't make mistakes or believe systems should be capable of preventing them from making a mistake and therefore blame the product instead of themselves. The "fly away" tales blossom from there. Yuneec insists on reviewing flight telemetry from more than just the incident flight for those reasons. The true fly away provides ample evidence of the event while something flown away tells a completely different story through the telemetry.
