The gulls here in Northern California are vicious. So far they are the only birds to go after my DJI mini 3, but they are consistent in attacking it anytime the gulls are around. I have no problem believing that this is what was affecting your drone. Like you, when I see the gulls around, I put it into sport mode and get it home ASAP.I was shooting a beach run for an estate agency when the segulls got me!
I managed to get it back, limping home
Here is the resulting video