my e-flite 20 amp never just shuts off you must have the cheep old broken one
because mine just makes my motor pulse at high rpm only after 20 minutes of flying which allows me to land safely thank you e-flite for making my 20 amp esc with pulsing cutoff

so i am going to dissagree with your statement that there junk because mine works great
and if i had to buy another esc (for the mini edge) it would be e-flite

just wondering are you using a gws receiver? could be your problem