Hi everyone - I flew my awesome Spark today. It was about 88-90 F outside. Everything was going great until I started on the 2nd battery. All of a sudden when I pushed sticks to go up.. it abruptly descended, I tried to re adjust using small adjustments and all off a sudden it just dropped like a brick form the sky and landed on my lawn. (thank god). Is this a know issue? Anyone else out there experiencing the same thing?