Inexplicably

The spacecraft encountered several hardware anomalies, many of which inexplicably fixed themselves.

When Tom stopped eating wheat, his health inexplicably got better.

But life is sad and solemn. We're dropped in a wonderful world, we find ourselves here, we introduce ourselves, and are together for a bit. Then we lose each other, and disappear just as suddenly and inexplicably as when we came.

William seemed inexplicably angry with Sandra.

The Ivorian then inexplicably handled the resultant corner and referee Nicola Rizzoli had no hesitation pointing to the spot.