Your losses are tragic. I've used Spektrum since the DX-7 hit the market, and I had only one loss, likely due to a badly planned power system. I now use a DX-8 and love it. But, I also use a Hitec A-9, and probably would for anything over two pounds or so: not because I've had an issue, but because I fear one based on reports like this one.
Again, your losses are tragic.