Kevin, NO! Incorrect!
The missile guidance was "tumbled" from a secret underwater lair by the notorious international criminal,
Dr. No was attempting to start an international incident by redirecting the missile to downtown Seoul, but the missile broke up with the sharp turn to the right.
Normally, Dr. No would then by apprehended by a certain British Agent. However, due to the recent switchover of the 00 division from dry martinis to
more carbohydrate rich beer, that certain British Agent was not in shape to catch this international criminal. Too much hops...
Fortunately an American Crime Fighter stepped in, apprehended the evil Dr. No, and is shown here questioning him:
Doesn't that make much more sense than your explanation??
In reality, about a minute after launch is when a missile hits what is called "Maximum Dynamic Pressure" (MaxQ), where the rapidly accelerating missile transits the maximum force of the (rapidly diminishing) atmospheric pressure. The Space Shuttle used to throttle down to pass through this region. It may be that this is the point of maximum stress at which the North Korean missile structure failed. Don't know if we will ever know for sure.
I more interested in knowing why or how it failed. Was it due to poor workmanship/ technology or did somebody sabotaged it?
As James Oberg pointed out a few days ago in commenting on the North Korean effort , "Space is hard". If you look at our early failure rates in the 1950's with the early Thor or Atlas missiles, there is a steep learning curve in building reliable hardware. This is, IIRC, only the third attempt by North Korea, so they are still early on that curve.
I would guess there is also some intelligence interest in examining what payload was really under the nosecone shroud of the missile.