How do you explain it?

Rams look like a solid playoff team after 3-0 start, including huge win over Saints (and don't forget Carolina started 4-2).
Then they lose three straight, including one of the worst performances (T in team history at home.
Then they go on a long extended road trip and beat Atlanta and Cincinnati heading into their bye.
Then they crap the bed in Pittsburgh.
Then they beat a decent Bears team and their offensive line looked great in doing so.
They they put up a second worst ever perfornance (Balt) at home.
Then they rebound and look great against Arizona and Seattle.
Then this debacle.

The only common denominator is that three times this season we were starting to get something going and then the defense played like they wanted no part of tackling or covering anyone.