My X9 is suddenly turned off and never turned on. I used for two months. I don't know why. How about lifetime of X9?
I had a similar issue... when using my rc11 remote I push accidently the on/off button below esc. Result was X9 turn off and I was forced to turn it on with the rear switch. An other issue could be the heat, I bought rubber feet higher to put under the unit (I used wood block in the meanwhile). Sometime in android you must reset unit because some file could be corrupt and if nothing help don't be affraid to flash with updat tool.
