Heard a new noise coming from my Spark!

[Farkle]

Hey Guys and Gals,
Had my Spark up yesterday in my backyard. After doing some sport mode figure 8's , I noticed a higher pitched whine , low but there, over my prop noise. I did try two different types of props checking if it was the props I was using. Still heard it in the background, very subtle but there. Motors?
Any ideas?
Thanks,
Farkle

 

[twickers14]

Above my “pay grade” but others will know. Hope it gets sorted.

 

[Farkle]

Above my “pay grade” but others will know. Hope it gets sorted.

Thanks, I appreciate your support.