U-shaped object, and then line arcs back and forth while decending. No idea what this is...

U-shaped object, and then line arcs back and forth while decending. No idea what this is...
Time:  4/16/25, 8:00pm EST

Location:  Sarasota, FL.

I finally saw something strange enough that I thought it was worth posting.  What it was, I don't have the foggiest.

Description:  U-shaped, white in color.  It drifted in a series of arcs (back and forth) while also losing altitude.  Immediately after losing sight behind tree, a small opaque line with sharply defined boundry appeared approximately where the U shape object originated.  Line also decended to the same general area as the U, though I did not notice any arcing back and forth.  It eventually disappeared and then reappeared moments after, though dimmer.  Could have gone behind a cloud, though it was clear skies, and I did not notice any cloud cover.  Possible natural phenomena?  Would love to hear some thoughts on this one.