could be a bad battery connection from the esc to the reciever or the reciever has some dirt in it?
on my 1/8th it did excatly the same,i took the reciever out of its case and there was some fine grit in the reciever case at the bottom,cleaned it all out.
also the reciever is a piggy back type where it joins together on 1 side with pins,you can pull the 2 circuit boards apart,now the early ones didnt have any foam between the 2 boards and under hard landing the 2 circuit boards would flex towards each other and short out for a split second,this cause the failsafe to kick in so worth having a look at that.
dave
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