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Looks like a typical tip stall to me, and pilot error.

Yes Sir. Simply tried to yank it around too hard while going too slow. Excessive elevator throw could have been a contributor as well.

+1 Accelerated stall.

One big hint is the amount of up elevator you can see while it's on the way down.

For as long as I have been in the hobby there have always been guys flying airplanes beyond their skill level, now we have the internet where guys can comment and attempt to advise beyond their skill level. Of course over inflated egos at play in both circumstances. The thing that really needs to be taught better is airplane set up and trimming. What I saw in the video is an airplane with adverse yaw, too much control throw and maybe too nose heavy. That combination when flown too slowly always ends the same way. Had the airplane been set up better the pilot may have had sufficient skill to keep out of trouble.

Ah yes Andy but the difference is that you and I can admit that no matter how long we have been doing something we remain open to learning more. Unlike some guys who " know everything " because they have read a few books and once built a Sig Kadet. Some even go so far as refuse to learn or accept information because they don't like where the information is coming from.

Nope, I have NEVER crashed...........LOL

In the 27, 53, and 72 MHz days, “ I got hit!!! I got hit!!!”

I doubt that was the case here. If you look closely the airplane actually snap/stalled twice. Once that took it into the spiral from horizontal flight and again just before impact. Just a poorly set up airplane that was flown too slow. The pilot was also holding a bunch of up elevator the entire time which just kept the airplane in a deep stall and caused the second snap.

Radio interference is something many guys should understand a bit better. I have seen installs that sent a chill down my spine. One case even had an antenna taped to an ESC. Interference and brown outs are not the same thing. A brown out is caused by a dip in voltage going into the receiver. More common with Spektrum as their critical voltage on the RX is about 4.5V. I strongly suggest running 6V batteries on any brand of 2.4GHZ systems. You should also always have enough capacity so that under high loads the voltage will not dip more the a couple tenths of a Volt. Unless you carry a Spectrum Analizer with you to the flying feild it is almost impossible to know what RF is in the area. Common sense would dictate that the more Urban your environment the higher your noise floor will be. Range checks are very useful. I always range check prior to a maiden flight, after replacing any electrical component in the airplane and when flying at a new site even if the airplane has been glitch free for hundreds of flights at the home field.