Oh for fucks sake.
Shit always comes off the ISS. Especially when the shudders are opened or closed.
The first flake doesn't go behind the radiator, (it's a radiator not a solar array as conspiracy guy states). It disappears because the white flake passes in front of the white radiator and the camcorder isn't focused on it.
The second flake is basically moving straight. It looks warped due to being shot through 4 panes of glass, the out of focus camcorder, and the lack of landmarks for your eye to track. Things move weirdly up there.
If you really want to see flying spaceships around the ISS here you go:
ATV
Cygnus
Dragon
HTV
Progress
Shuttle
Soyuz