I've notice the past couple times I fly high, birds just start coming from out of nowhere and circling my spark. Today it was small birds then some bigger ones showed up?

Yup...I often get sea gulls turning up out of nowhere to investigate my drone. I've read that quickly gaining altitude is the best way to lose them.

yes appened the same to me with spark!

6#
I saw a youtube video that was recently posted.   Some guy figured out how to deter birds from approaching his drones because he had lost 3 drones and was sick of it.   He's supposed to be revealing his new invention soon.  that could be interesting.  Ill have to see if I can find the video.   it was something like "Avoiding drone bird attacks"    I was just outside with my phnatom and several hawks looked quite interested.  eeek..