Earlier quoted context omitted.
Why so long? Will they need to go through another round of FAA approval? Or?
They need to redesign the bottom half of the rocket so it doesn't blow up during staging, and figure out what happened to the top half and fix that.
For the second stage, my guess is they triggered the FTS due to the telemetry issues or just for safety's sake, i.e. they didn't want to take any risk with the lack of telemetry.