It could also be that the Russians are purposely having the tests fail (having tested the real models secretly) so they can build tons of the missiles without us saying anything about it.
Also they have been upgrading their old missiles.
Medvedev issued a decree ordering the replacement of General Nikolai Solovtsov by General Andrei Shvaichenko as commander of the Russian Strategic Rocket Forces. He was fired of the string of failures in the last year both land based missiles and sea based missiles. They are upgrading their current stockpile of missiles.
I always keep tabs on their missile leadership and the overal status of the Strategic Rocket Forces.