hi. just 2 days ago, my multiwii SE 2.5 armed by itself and run all 800kv motor for just a couple of seconds. It happen after approx. 5 zecond i plug the 4s lippo. Luckly my hand a centimeter a way from 11" props. after that, the esc, one by one make a beep (not in sync like).. It happen all th...