Its just strange that its not every night so maybe its fog particles. Really a pain when you want to find something and it causes 5+ hours of almost constant alert recording.
I am in NJ and we are having out of the norm warm temperatures, I even seen a mosquito yesterday and its only February and the normal high this time of year is 40 and today its already 72.
That stuff looks like tiny insects to me since I see no wind action at all on camera. Insects seem to see IR and I get the same effect when weather gets warmer. I also get the fog reflection on IR too. Looks like a hurricane on IR enabled cameras.